The Cambridge natural history . Fig. 135.—Eadula of Elysiaviridis Mont. x 40. Type Fig. 136.—Portion of the radulaof Gadinia2}eruviana Sowb.,Chili. X 250. Type (c). in Polycera, Lamellidoris (where there is a degraded centraltooth, Fig. 137, B), Idcdia, and Aiicula. (c) Eadula with an indefinite number of marginals, laterals(if present) merging into marginals, central tooth present orabsent, inconspicuous, teeth all very small. This type of radula,among the Nudibranchiata, is characteristic of certain subgeneraof If oris ( Chromodoris, Aphelodoris, Casella, Ccntrodoris), ofHypobrancli

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The Cambridge natural history . Fig. 135.—Eadula of Elysiaviridis Mont. x 40. Type Fig. 136.—Portion of the radulaof Gadinia2}eruviana Sowb.,Chili. X 250. Type (c). in Polycera, Lamellidoris (where there is a degraded centraltooth, Fig. 137, B), Idcdia, and Aiicula. (c) Eadula with an indefinite number of marginals, laterals(if present) merging into marginals, central tooth present orabsent, inconspicuous, teeth all very small. This type of radula,among the Nudibranchiata, is characteristic of certain subgeneraof If oris ( Chromodoris, Aphelodoris, Casella, Ccntrodoris), ofHypobrancliiaca and Pleuro2^hyUidia; among the Tectibranchiata,of Actaeon, many of the BuUidae, Axjlustruin, the Aplysiidae,PUurobranclius, Umbrella and Gadinia (Figs. 136 and 137, C). In the Pterojioda there are two types of radula. The Gymno-somata, which are in the main carnivorous, possess a radula wath avarying number (4-12) of sickle-shaped marginals, central toothpresent or absent. In the Thecosomata, which feed on a vegetabled

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895