PLATE XVII. 



d. 



2. 



Scalar ia. 



The female Vivipara taken out of its shell, and the branchial cavity 

 opened. 



h. The orifice of the womb. 



a. The foot folded in two. 



b. 



c. 



f. 



g- 

 h. 



operculum attached to its 



posterior part, 

 head, with the tentacula 



and trunk, 

 little siphon prolonged 



under the right tenta- 



culum. 

 lateral membrane of the 



left side, 

 edge of the mantle, 

 branchiae. 



womb swelled by the foe- 

 tus within. 



h. 

 i. 

 I. 

 m. 



n. 

 o. 



part situated under the spire, 

 anus. 



canal of viscous matter. 



projecting line, forming a se- 

 mi-canal, which terminates 

 at the siphon d. 



heart and its auricle. 



parts of the liver and intestine. 



P- 

 P. 



o. 



4. 

 5. 



6. 



8. 

 11. 

 12. 

 13. 



Trochus. ( Cochlea sublivida, Lis.) 



h. The head. 

 tt. .. tentacula. 

 ee. .. eyes. 



Do. seen underneath. 

 /. The foot. 1 

 Animal of the Trochus pharonius, taken out of its shell, with its oper- 

 culum. 



7. . . . . Turbo littoreus. 



The languette. 

 . . foot. 

 .. operculum. 



m. The mouth. 



9.10 



Turbo chrjsostomus. 

 Nerita canrena, taken out of its shell. 

 Neriia eiuvia, with its operculum. 

 Trochus, Gualt. 



