CONCHOLOGY. 



93 



F. rosea. 

 F. Barbadensis. 

 F. radiata. 

 F. nodosa. 

 F. nhnbosa. 

 F. crassa. 

 F. Grseca, 

 F. picta. 



F. alternata.* 



F. pustula. 

 F. hiantula. 

 F. viridula. 

 F. depressa. 

 F. Peruviana. 

 F. gibberula. 

 F. minuta. 

 F. plicata. 



F. redimicula.* 



4. Genus Pileopsis. PI. X. 

 Animal. With two conical tentacula, and the eyes at their 

 base ; branchiae formed in a row under the anterior margin of the 

 -cavity, near the neck. 



Shell. ObUquely conical, anteriorly recurved, apex bent, 

 almost spiral ; aperture rounded, elliptical, the anterior margin 

 shortest, acute, slightly sinuated ; the posterior largest and round- 

 ed. One elongated and arched muscular impression, situated 

 under the posterior margin. Inhabits the seas of Europe. Nine 

 species. 



Pileopsis intorta. Pileopsis ungarica. 



P. subrufa. P. mitula. 



P. spirirostris. P. pennata. 



P. retortella. P. squamsefovmis, 



P. depr 



5. Genus Calyptrea. PI. X. 



Animal. The same as preceding genus. 



Shell. This genus derives its common name, "the Cup-and- 

 Saucer Limpit," by having in the interior cavity a cup-shaped 

 appendage, which is sometimes vertical, and sometimes like a 

 horse shoe, with a muscular impression of variable form, vertex 

 ending in a small volution ; smooth, margin entire, ver}' glossy 

 within, and provided with a laminar plate. Inhabits the Chinese 

 and S. American seas. Nine species. 



Calyptrea porcellana. Calyptrea equestris. 



