. Forms of animal life; being outlines of zoological classification based upon anatomical investigation and illustrated by descriptions of specimens and of figures . ures of the Heteropodous Carinaria and Pte-rotrachea in V. Carus^ Icones Zootomicae, tab. xx., fig. 13;Gegenbaur, Untersuchungen iiber Pteropoden, und Hcteropo-den, 1855, tab. vii., fig. i; Vergleichende Anatomic, p. 325,fig. two sets of organs of special sense, the auditory and theophthalmic, are thus seen in Gasteropoda to be both in connectionwith the same nerve-centres. The attachment, however, of the oticvesicle and ne
. Forms of animal life; being outlines of zoological classification based upon anatomical investigation and illustrated by descriptions of specimens and of figures . ures of the Heteropodous Carinaria and Pte-rotrachea in V. Carus^ Icones Zootomicae, tab. xx., fig. 13;Gegenbaur, Untersuchungen iiber Pteropoden, und Hcteropo-den, 1855, tab. vii., fig. i; Vergleichende Anatomic, p. 325,fig. two sets of organs of special sense, the auditory and theophthalmic, are thus seen in Gasteropoda to be both in connectionwith the same nerve-centres. The attachment, however, of the oticvesicle and nerve can scarcely be different in reality from what itis in appearance in the Lamellibranchiata (for which see pi. );and the multiplicity of the eyes in Pecten and Spondylus setalong the border of the mantle, to the nervous supply of whichboth cephalic and parieto-splanchnic ganglia contribute, would leadus to expect variability rather than fixity in the connections of theorgans of special sense in Mollusca. The varying allocation of theorgans of special sense in the two sub-kingdoms, Arthropoda andVernus^ would appear to pomt in the same direction. % Hi Ph. hi 9 PLATE V. Feesh-water Mussel {Anodonta Cygnea), Dissected so as to show its muscular and nervous systems, as well as certain otherorgans in relation with them. The animal has been taken out of the shell; the gills have beenremoved on the left side, as also the mantle, tog-ether with thelabial tentacles and parts of the pericardium, and of the organ ofBojanus of the same side. a. Eight mantle lobe, free along its ventral edge. a. Fimbriated portion of mantle corresponding to the inlet by which water is drawn into the branchial \ Dorsal raphe along which the two halves of the mantlemeet, and are more or less united. b. Foot. c. Gills of right side. c. Process passing from external gill to join the mantle, justwhere its fimbriae cease and its anal region commences. d. Anterior adductor, e. Posterior adductor. /.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
