. Comparative anatomy. Anatomy, Comparative. FOOT GANGLION INTESTINE NEPHRIDIUM MANTLE CAV Fig. 9.—Diagrams of a Mollusc. Figure A shows a longitudinal section, while £ is a cross section. (Redrawn from Stempell, after Kuhn and Sedgwick.) The nervous system has a circumesophageal ring and a series of cerebral, pedal and visceral ganglia with their commissures and connectives. Sense organs are varied. Many molluscs are hermaphroditic, the gonads opening into coelomic sacs. Development involves metamorphosis, and the veliger larva resembles the trochophore larva of annelids.
. Comparative anatomy. Anatomy, Comparative. FOOT GANGLION INTESTINE NEPHRIDIUM MANTLE CAV Fig. 9.—Diagrams of a Mollusc. Figure A shows a longitudinal section, while £ is a cross section. (Redrawn from Stempell, after Kuhn and Sedgwick.) The nervous system has a circumesophageal ring and a series of cerebral, pedal and visceral ganglia with their commissures and connectives. Sense organs are varied. Many molluscs are hermaphroditic, the gonads opening into coelomic sacs. Development involves metamorphosis, and the veliger larva resembles the trochophore larva of annelids. Sixty-one thousand species are recognized. The phylum contains a number of primitive or aberrant forms, among which are the chitons with eight calcareous plates on the back instead of a single shell, dentalium with a nearly straight tapering shell open at both ends, and certain marine forms that are worm-like and without shells. Though the molluscs as a group are highly successful in the struggle for existence, as witness the multitude of their species, and the enormous. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
