The Cambridge natural history . ileuro-pedal commissures can be recognised by sections of the mass(Pelscneor, Comptcs llendus, cxi. p. -45). Fig. 105.—Nervous system of Pelecy-poda : A, Teredo: B, Anodonta,C, Prcten; a, a, cerebral gangliah, pedal gau:j;lia ; e, visceral ganglia,(Atter Gegenbaur.) NERVOUS SYSTEM IN PELECYPODA 207 osphradia, and ^?iscera generally, forming a special genital gang-lion in connection with the reproductive organs. Tlic principalganglia of tlie l)iljran(luata are still more concentrated, eventhe visceral loop being possibly nnited with the rest in formingan iinbroke
The Cambridge natural history . ileuro-pedal commissures can be recognised by sections of the mass(Pelscneor, Comptcs llendus, cxi. p. -45). Fig. 105.—Nervous system of Pelecy-poda : A, Teredo: B, Anodonta,C, Prcten; a, a, cerebral gangliah, pedal gau:j;lia ; e, visceral ganglia,(Atter Gegenbaur.) NERVOUS SYSTEM IN PELECYPODA 207 osphradia, and ^?iscera generally, forming a special genital gang-lion in connection with the reproductive organs. Tlic principalganglia of tlie l)iljran(luata are still more concentrated, eventhe visceral loop being possibly nnited with the rest in formingan iinbroken mass in wliich scarcely any trace of commissures. Fi(i. 106.—Nervous system of Cardium edide L.: , iinterior ;idductor juiiscle ; br,branchiae; , brancliial nerve; eg, eg, cerebral ganglia; c.^.t, cerebro-pedalcomiuissure ; , cerebro-visceral commissure ; , cerebro-visceral commissureof mantle ; ), labial ^jalps ; vi, mouth ; , pedal ganglion; i-, posterior adductormuscle ; , visceral ganglion. (After Drost, x o.) can l)e detected. Tlie pedal ganglion becomes separated intotwo portions, one of which innervates the arms, tlie otlior thefunnel. Two ])eculiar ganglia (the stellate ganglia) supply aHandler of brauchim nerves to the mantle. E. L, Bouvier, Systume nerveux, morpliologie generale et classiticaliou desGasttropodes prosobraiiclies : Ann. Sc. Nat. Zoo]. (7 iii. 1887,pp. Brock, Zur Neurologie dcr Irosoljranchier : Zeit. -wiss. Zool. xlviii. 1889, pp. Biitschli, Bemerkungon ul)er die \valii8cliL-inliclie Herk-itunij, di i- Asyni- nietiie der (lasteropoda, etc. : Morpli. Jalirb. xii. 1
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
