200 



MANUAL OF THE MOLLUSCA. 

 CARINARIA, Lamarck. 



Fig. 105.* 



Eym. Carina, a keel (or keeled vessel.) 



Type. C. cymbium, L. fig. 105, PI. XIV. fig. ]9. 



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, cylindrical; 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, project- 

 ing from beneath the shell. 



Distr. 5 sp. Medit. and warmer parts of the Atlantic and Indian 

 Oceans. They feed on small Acalepha, and probably on the pteropoda ; Mr. 

 Wilton found in the stomach of a Carinaria two fragments of quartz rock, 

 weighing together nearly 3 gr. 



Fossil, 1 sp. Miocene. Turin. 



CARDIAPODA, D'Orbigny. 

 Ex. C. placenta, PL XIV. fig. 20. 



Etym. Cardia, heart, pous, foot. Syn. Carinaroides, Eyd. and Souleyet. 

 Animal like Carinaria. Distr. 5 sp. Atlantic. 



Shell minute, cartilaginous ; peristome expanded and bi-lobed in front, 

 enveloping the spire behind. 



FAMILY II. ATLANTIC. 



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

 gills contained in a dorsal mantle-cavity ; lingual teeth similar to Carinaria. 

 Shell symmetrical, discoidal, sometimes closed by an operculum. 



ATLANTA, Lesueur. 



Type, A. Peronii, PL XIV. fig. 21-23. Syn. Steira, Esch. 

 Shell minute, glassy, compressed and prominently keeled ; nucleus dex- 



* Fig. 105. p. proboscis; t, tentacles; 6, branchias ; s, shell; /, foot; d, disk. 



