GASTEEOPOBA- 



Caeinaeia, Lamarck. 



143 



Fir 141.* 



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



Type, C. cymbiuni, Desh. == 0. cristatus, L., Eig. 141, PI. 

 XIV., Eig. 19. 



Shell hyaline, symmetrical, limpet- shaped, with a posterior 

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

 dextrally spiral. 



Animal large, translucent, granulated; head thick, 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 compreseed ; 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 Acakphce, 

 and probably on the jpteropoda ; Mr. Wilton found in the 

 stomach of a Carinaria two fragments of quartz rock, weighing 

 together nearly 3 grains. 



Fossil, 1 species. Miocene. Turin. 



Oaediapoda, D'Orbigny. 



Example, C. placenta, PI. XIY., Pig. 20. 

 Etymology, cardia, heart, potis, foot. 

 Synonym, Carinaroides, Eyd. and Souleyet. 

 Animal like Carinaria. 

 Distrihution, 5 species. Atlantic. 



Shell minute, cartilaginous ; peristome expanded and bi-lobed 

 in front, enveloping the spire behind. 



Eamilt II. — ^Atlantidje. 

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

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



