200 



MANUAL OF THE MOLLUSCA. 

 Carinaria, Lamarck. 



I 



Fig. 105.* 



Ei/m. Carina, a keel (or keeled vessel.) 



Type. C. cymbium, L. fig. 105, PL XIV. fig. 19. 



SJiell hyaline, symmetrical, limpet-sliaped, with a posterior sub-spiral 

 apex and a fimbriated dorsal keel ; nucleus minute, dextrally spii-al. 



Jnimal large, translucent, granulated ; head thick, cylindrical ; lingual 

 ribbon triangulai', 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 Acalephce, and probably on the jderopoda ; 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, PI. XIV. fig. 20. 

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

 Animal like Carinaria. Distr. 5 sp. Atlantic. i 



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

 enveloping the spire behind. 



f 



FAMILY II. Atlantid^. 

 ^?^^»^<a;/ furnished with a weU-developed shell, into which it can retire; 

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

 Shell symmetrical, discoidal, sometimes closed by an operculum. 



Atlanta, Lesueur. 

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

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



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



