. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 5. The animal slightly magnified, with the mantle opened from the flat side, showing the retractor muscle and the viscera in situ. 6. The same, with the viscera displayed. 7. The same, seen from the opposite aspect: the integument of the neck has been divided as far as the mouth, showing the respective positions of the brain, of the oesophagus, of the penis, and the tongue r like terminations of the retractor y 8. The penis detached. The crop and gizzard laid open. The same references apply to all the figures. a
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 5. The animal slightly magnified, with the mantle opened from the flat side, showing the retractor muscle and the viscera in situ. 6. The same, with the viscera displayed. 7. The same, seen from the opposite aspect: the integument of the neck has been divided as far as the mouth, showing the respective positions of the brain, of the oesophagus, of the penis, and the tongue r like terminations of the retractor y 8. The penis detached. The crop and gizzard laid open. The same references apply to all the figures. a, b, c, prominent points of shell; d, inflated valve ; e,f, lateral margins of the shell; g, h, i, k, margins of mantle ; /, m, cervical fins ; n, mouth ; o, neck ; p, q, r, s, branchiae; t, position of the heart; u, re- tractor muscle; v, v, oesophagus; w, crop; x, giz- zard ; y, intestine; z, liver; «, ovary; p, testicle; y, supra-cesophageal ganglion. other viscera occupy the arched and rounded portion of the shell, or the interior of the cervical region, and are enveloped in a kind of peritoneum of a blackish colour. On plac- ing the animal upon its flat valve, or ventral surface, the heart is seen to be situated on the right side, at the inner border of that portion of the branchial band marked t in fig. 114. 5. A cylindrical muscle (u, Jig. 114. 5 and 7) is attached to the intermediate point of the shell, and traverses the visceral mass to be inserted into the neck by four tongue-like processes. The action of this muscle will be to retract the creature within its shell. In front of the four branchias is situated the penis, upon which lies the oesophagus, and this in turn is surmounted by the brain— these organs filling up the thickness of the neck. The resophagus (v,i\Jig. 114. 5 and 6) is long and slender, and the mouth, according to Cuvier, is a simple anterior opening, in the interior of which a few wrinkles only are perceptible, representing the tongue. The oesoph
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