GASTEHOPODA- 



Carinaeia, Lamarck. 



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Etymology, carina, a keel (or keeled vessel). 



Type, C. cymbium, Desh. = C. cristatus, L., Fig. 141, PI. 

 XIV., Fig. 19. 



Shell hyaline, symmetrical, limpet-shaped, \ritli a posterior 

 sub-spiral apex and a fimbriated dorsal keel • nucleus minute, 

 dextrally spiral. 



Animal large, translucent, granulated; bead tbick, cylin- 

 drical; lingual ribbon triangular, teeth increasing rapidly in 

 size, from the front backwards ; tentacles long and slender, eyes 

 near their base ; ventral fin rounded, broadly attached, with a 

 small marginal sucker ; tail large, laterally compressed ; nucleus 

 pedunculated, covered by the shell, gills numerous, pinnate, 

 projecting from beneath the shell. 



Distribution, 8 species. Mediterranean and warmer parts of 

 the Atlantic and Indian Oceans. They feed on small Acalephce, 

 und probably on the pteropoda ; Mr. Wilton found in the 

 stomach of a Carinaria two fragments of quartz rock, weighing 

 together nearly 3 grains. 



Fossil, 1 species. Miocene. Turin. 



Cardiapoda, D'Orbigny. 



Example, C. placenta, PI. XIV., Fig. 20. 

 Etymology, cardia, heart, pons, foot. 

 Synonym, Carinaroides, Eyd. and Souleyet. 

 Animal like Carinaria. 

 Distribution, 5 species. Atlantic. 



Shell minute, cartilaginous ; peristome expanded and bi-lobei 

 in front, enveloping the spire behind. 



Family II. — Atlat^tid^. 

 Animal furnished with a well-developed shell, into which it 

 « Fig. 141. p, proboscis ; t, tentacles ; b, branchiae ; s, shell ; /, foot ; d, disc. 



