File:Text-book of comparative anatomy (1898) (14592851568).jpg

Identifier: textbookofcompar01lang (find matches)
Title: Text-book of comparative anatomy
Year: 1898 (1890s)
Authors: Lang, Arnold, 1855-1914 Bernard, Henry Meyners Bernard, Matilda Haeckel, Ernst Heinrich Philipp August, 1834-1919
Subjects: Anatomy, Comparative
Publisher: London, New York, Macmillan and Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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ervous system of the Rhizocephala (SaccuUna, PcUogastcr),which are so much degenerated by parasitism ; we here find it in the form of onesingle ganglion, from which various nerves radiate (cf. Fig. 248, p. 373). Thisganglion is said not to correspond with the larval supra-cesophageal ganglion, but toarise anew in the development of the adult animal. Malaeostraea. I. Leptostraea.—The interesting genus Nelalia, which of all living)\I<iIncostroca stands nearest to their racial form, possesses an extra-ordinarily richly segmented nervous system. If this pronouncedsegmentation recalls, on the one hand, the nervous system of the Phyl-liij/tiiln (Bramchiopoda), it shows on the other (especially in the structureof the brain) a decidedly Malacostracan character. The ganglia for theposterior antennae are moved far forward on the oesophageal commissures,and form, as in all Malaeostraea, the most posterior division of the brain.The transverse commissure, which corresponds with them, however,
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FIG. 236. CHAP, v CRUSTACEA— XERVOUS SYSTEM 347 Flu. 230.—Central nervous systems of various Crustaceans. A, Of Euphausia pellucida(after G. O. Sars). Ji, Of Astacus fluviatilis (alter Vogt and Yung). C, Of Apseudes Latreillii(combined from several figures by Claus). D, of Limnadia (after Klunzinger), anti-rinr portion.E, Of Asellus aquaticus (after G. O. Sars). F, Of Maja squinado (after Milne Edwards). G, OfArgulus Corregoni (after Claus). H, Of Sapphirina Edwardsii (after Haeckel). <ig, Brain ; cm,nerves of the paired eyes ; tia, unpaired eye with its nerve ; go, ganglion opticum ; «i, nerve of the1st antenna; oo, of the 2d antenna; sc, cesophageal commissures; y, post-cesophageal trauversecommissure of the same (commissure of the antrnnal ganglia of 2d antenna?) ; a«g, ganglion of the•_d antenna (in D); md, mandibular ganglion ; M.TI, mx*, ganglia of the 1st and 2d pairs of maxilla;;1-V1II. thoracic ganglia; lig, sub-cesophageal ganglion, consisting of several fused gan

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