CONCHOLOGY. 93 
F. rosea. F. pustula. 
F. Barbadensis. F. hiantula. 
F. radiata. F. viridula. 
F’. nodosa. F. depressa. 
F. nimbosa. F. Peruviana. 
F. crassa. F. gibberula. 
F. Greca. F, minuta. 
F. picta. F. plicata. 
F. alternata.* F. redimicula.* 
4, Genus Pileopsis. Pl. X. 
Animal. With two conical tentacula, and the eyes at their 
base ; branchie formed in a row under the anterior margin of the 
cavity, near the neck. 
Shell. Obliquely 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. squameformis. 
P. depressa. 
5. Genus Calyptrea. Pl. 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, very glossy 
within, and provided with a laminar plate. Inhabits the Chinese 
and S. American seas. Nine species. 
Calyptrea porcellana. Calyptrea equestris. 
