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264 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Fig. 10. Posterior view of five teeth of the radula. Drawn 

 under the Edinger Projection Apparatus. X 70. 



Fig. 11. Three teeth from the gizzard, a and b are from 

 the anterior and c from the posterior portion of 

 the gizzard, x 3. 



Fig. 12. Dissection of the stomach, caecum and the beginning 

 of the intestine, from the ventral side. The 

 portion from A to B, with the exception of the 

 intestine, is embedded in the visceral mass, which 

 has been dissected away to expose it. The 

 intestine comes to the surface and lies in a channel 

 on the surface of the visceral mass. The stomach, 

 intestine, caecum, and the left bile duct have been 

 cut open longitudinally, x 3. 



Fig. 14. Dissection to show the afferent and efferent vessels 

 of. the ctenidium. The kidney has been partly cut 

 away to expose the heart. The efferent renal 

 vessels lie on the ventral side of the kidney. 

 X 1-75. 



Fig. 15. Dissection to show the kidney and renal portal 

 system. From an injected specimen. The afferent 

 renal vessels lie on the dorsal surface of the kidnev. 

 X 1. 



Fig. 17. Dissection of stomato-gastric system as seen from 

 the ventral side of the buccal mass. The cerebral 

 and pedal ganglia, pedal and parapedal commis- 

 sures are shown, but the cerebral ganglia have 

 been separated from one another and their com- 

 missures cut. X 3-5. 



Plate IV. 



Fig. 13. General dissection from the dorsal side to show 

 the heart and blood vascular system. Other organs 

 are shown only where necessary to demonstrate 

 the relations of the parts. The genital annexe 

 has been displaced backwards. The position of 

 the genital artery relative to the hermaphrodite 

 duct is variable. The cerebral ganglia are not 

 shown, and the pleural and pedal ganglia have 

 been laterally displaced. X 2-5. 



