. Outlines of zoology. Fig. 227.—Dorsal viewof nervous system ofAcanthochiton. —AfterPelseneer. I, Upper buccal commissure; 2, upper buccal ganglion ; 3, stomatogastric commis-sure; 4, labial commissure;5, sub-radular ganglia; 6,anterior pedal commissure;7, pedal nerve with pallio-pedal connections ; 8,supra-rectal pallial com-missure; 9, pallial nerve;zo, anastomosis of branchesof pedal nerves; iT,stomato-gastric ganglia ; 12, oeso-phageal nerves; 13,cerebral,commissure. GASTEROPODA. 419. Fig. 228.—Anatomy of Chiton. ventral surface (after Cuvier). B, doisal view of alimentarycanal (after Lan
. Outlines of zoology. Fig. 227.—Dorsal viewof nervous system ofAcanthochiton. —AfterPelseneer. I, Upper buccal commissure; 2, upper buccal ganglion ; 3, stomatogastric commis-sure; 4, labial commissure;5, sub-radular ganglia; 6,anterior pedal commissure;7, pedal nerve with pallio-pedal connections ; 8,supra-rectal pallial com-missure; 9, pallial nerve;zo, anastomosis of branchesof pedal nerves; iT,stomato-gastric ganglia ; 12, oeso-phageal nerves; 13,cerebral,commissure. GASTEROPODA. 419. Fig. 228.—Anatomy of Chiton. ventral surface (after Cuvier). B, doisal view of alimentarycanal (after Lankester). C, genital and excretory organs fromdorsal surface (after Lang and Haller, diagrammatic). 7n.,mouth ; a., anus ;^., numerous simple gills ;y^, foot; li., buccalmass; /., liver ; z*., intestine ; at;., aorta ; z., ventricle of heart; and /.«., right and left auricles ; ovary ; od., oviduct;od., opening of oviduct; «., part of nephridium, represented inblack throughout; no.^ external opening of nephridium;^.,outline of pericardium. Sub-class II. Gasteropoda Anisopleura, ], Whelk, Limpet In these more or less asymmetrical Gasteropods, the headregion, which is well developed, remains symmetrical, and sodoes the foot, which is typically a flat creeping organ. Butthe visceral mass or hump, with its mantle fold, is more or lesstwisted forwards and to the right. Thus the pallial, anal,nephridial, and genital apertures usually lie on the right side,more or less
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
