Pacific Science Volume 17, Number 3, 1963

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Pacific Science is a quarterly publication devoted to the biological and physical sciences of the Pacific Region.


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    Notes: On Malayan Shores: A Review
    (University of Hawai'i Press, 1963-07)
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    Notes: Additional Plants from the Midway Islands
    (University of Hawai'i Press, 1963-07)
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    Lord Howe Island, A Riddle of the Pacific, Part III
    (University of Hawai'i Press, 1963-07) Paramonov, S.J.
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    A Simple Device for Making Successive Photomicrographic Records of Large Groups of Developing Organisms
    (University of Hawai'i Press, 1963-07) Hsiao, Sidney C. ; Fujii, Walter K. ; Fine, Helen H.
    In our analysis of the effect of ionizing radiation upon the cleavage of sea urchin zygotes we found it necessary to take successive photomicrographs of a large number of eggs, in different samples, which had been exposed to graded doses of ionizing radiation (Hsiao and Daniel, 1960). In order to estimate the rate of cleavage of the irradiated samples of fertilized eggs it is highly desirable to follow the cleavage of each egg in every sample and make photomicrographic records for later analysis. In other words, we need to take time-lapse pictures of the developing eggs subjected to different amounts of radiation so as to calculate the rate of cleavage and correlate it with dosage. After some preliminary trials we have put together, using commonly available materials, a simple device capable of taking photomicrographs repeatedly from the same field in a series of samples of irradiated eggs at specified time intervals. By lining up, according to time, prints made from each field, each egg can be identified and its cleavage followed from the first to the last frame in the series, and its rate of cleavage can be calculated. It occurs to us that investigators who have occasion to record developmental and other recurrent phenomena may find this simple device useful. A brief description of its method of construction and manipulation is reported in this paper.
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    Field Identification of Five Species of Californian Beach Hoppers (Crustacea: Amphipoda)
    (University of Hawai'i Press, 1963-07) Bowers, Darl E.
    While studying the correlations between the distribution of five species of beach hoppers of the genus Orchestoidea and the physical and biotic factors of their sandy beach habitat, it became necessary to identify with certainty the animals collected from the many beaches sampled up and down the Californian coast. Since it was desirable tentatively to name the hoppers captured in the field, I made an effort to find characters which were easily observed on the beach and would allow such identification. As a result of my examination of many thousands of animals from over a hundred collecting localities, I evolved a recognition of the five species mainly on the basis of pigmentation patterns, elements of which are relatively consistent in spite of the many variations to be found in the total pigmentation.
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    Ecological Observations on the Sea Cucumbers Holothuria atra and H. leucospilota at Rongelap Atoll, Marshall Islands
    (University of Hawai'i Press, 1963-07) Bonham, Kelshaw ; Held, Edward E.
    In a distributional study of the black sea cucumbers, Holothuria atra (Jager) and H. leucospilota (Brandt), at Rongelap Atoll (Fig. 1) the beaches of most of the larger islets were surveyed during September 1959, March 1961, and September 1961. Estimates of abundance and size were made, and observations on temperature tolerance, predation, asexual reproduction by fission, and some other ecological aspects were considered.
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    Toxicity of Dialyzed Extracts of Some California Anemones (Coelenterata)
    (University of Hawai'i Press, 1963-07) Martin, Edgar J.
    Anemones of the California coast, collected from November 1960 to March 1961, were compared with respect to their toxicity. Aqueous extracts of the anemones were dialyzed and assayed by intraperitoneal injection to mice, and the survival times of the injected mice were compared. The extracts of Anthopleura elegantissima and A. xanthogrammica were by far more toxic than those of Metridium senile, Corynactis californica, Tealia crassicornis, T. lofotensis, and T. coriacea. The differences in potencies of the extra cts may indicate species variations m (1) toxicity, (2) efficiency of the extraction method, or (3) both.
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    Lithoglyptes hirsutus (Cirripedia: Acrothoracica), A New Burrowing Barnacle from Hawaii
    (University of Hawai'i Press, 1963-07) Tomlinson, Jack T.
    Two samples of coral from Kaneohe Bay, Oahu, Hawaii , have each yielded a number of specimens of a new species of acrothoracican burrowing barnacle of the family Lithoglyptidae. Samples of Psammocora verrilli Vaughan collected by Stephen A. Wainwright,2 and of Porites compressa Dana collected by Charles Stasek, were referred to me by William A. Newman. These barnacles are the first representatives of the order Acrothoracica known from Hawaii.
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    Studies in Fitchia (Compositae): Novelties from the Society Islands; Anatomical Studies
    (University of Hawai'i Press, 1963-07) Carlquist, Sherwin ; Grant, Martin L.
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