Pacific Science Volume 18, Number 2, 1964

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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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    Recent Observations on Neck Extensions in Folliculinids (Protozoa)
    (University of Hawai'i Press, 1964-04) Matthews, Donald C.
    Despite species variations , the process of folliculinid lorica formation is fundamentally similar (Penard, 1919; Andrews, 1923; Faure-Fremiet, 1932; Dewey, 1939; and Das, 1947). In all a motile, nonfeeding stage becomes attached, secretes a sac and neck, and gradually metamorphoses into a sessile feeding stage characterized by peristomal lobes.
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    Generalized Titanomagnetite in Hawaiian Volcanic Rocks
    (University of Hawai'i Press, 1964-04) Katsura, Takashi
    A ferromagnetic oxide mineral with spinel structure was separated from Hawaiian volcanic rocks ranging from basalt to trachyte. The chemical compositions of all the specimens have been arranged on an oxygen reaction line, and can safely be interpreted as the result of a process of either oxidation or reduction of material with composition on or near this line. In the trachyte the mineral was found to be highly oxidized titanomagnemite. The composition of Hawaiian titanomagnetites is compared with that of titanomagnetites found in Japanese volcanic rocks belonging to the calc-alkali rock series.
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    The Taxonomy of Polysiphonia in Hawaii
    (University of Hawai'i Press, 1964-04) Menez, Ernani G.
    An investigation of Polysiphonia collections from Oahu, Hawaii, Molokai, and Maui of the Hawaiian Islands has revealed the presence of seven species: Polysiphonia mollis Hook. & Harv., Polysiphonia pulvinata (Roth) J. Ag., Polysiphonia subtilissima Mont., Polysiphonia ferulacea Suhr., Polysiphonia yonakuniensis Segi, Polysiphonia flabellulata Harv., and Polysiphonia rhizoidea sp. nov. These seven species of Polysiphonia were recognized primarily by their morphological features. Some characteristics of Polysiphonia which have not been previously used by monographers but which appear to be important criteria for delimiting specific entities are discussed. One of these is the presence of more than one secondary pit connection between adjacent pericentral cells, a condition present in P. rhizoidea and P. yonakuniensis but not in the other 'species mentioned above. The other is the presence of multicellular rhizoids, a condition which was observed only in P. rhizoidea. Previously, authors have accepted the rhizoids of Polysiphonia as being unicellular.
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    Some Aquatic Fungi Imperfecti from Hawaii
    (University of Hawai'i Press, 1964-04) Anastasiou, C.J.
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    Identification of Leptocephalus acuticeps Regan as the Larva of the Eel Genus Avocettina
    (University of Hawai'i Press, 1964-04) Orton, Grace L.
    Regan (1916: 140, pI. 7, fig. 5) based the description of a distinctive new eel larva, Leptocephalus acuticeps, on a single 47-mm specimen from the South Atlantic. He did not attempt to allocate this larva within the eel classification, but D'Ancona (1928: 109) and Bertin (1936:7) assigned it to the Congridae. Although no additional specimens of 1. acuticeps appear to have been reported since the brief original description, Bertin re-examined the original larva and gave important supplementary information on it, and an additional illustration.
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