CYPEiEAD^. 127 



Tribe II. Siphonostomata. 



Sliell spiral ; aperture notched or produced into 

 a canal in front ; operculum horny, plaited. Animal 

 furnished with a retractile proboscis ; eye-stalks 

 united to the tentacles ; margin of the mantle pro- 

 duced into a breathing-siphon ; gills comb-like, 

 placed obliquely across the back. 



Spire concealed Ci/prcead<s. 



Spire manifest : 



Outer lip notched behind . . Conidce. 

 Outer lip entire behind : 



Lip notched in front . . Bucciyiidce. 



Lip produced into a canal . Mzcricidce. 



Family I. Cype^ad^. 



Shell rolled as a scroll, covered with a porcelain- 

 like enamel ; spire concealed ; aperture narrow, 

 long, channelled before and behind ; outer lip (in 

 adult age) thickened, and turned in. Animal with 

 a broad foot ; mantle with wide side-lobes, which 

 turn up over the shell. 



Cyprcea (Linn.). Coiory, Shell swollen ; outer 

 and inner lip wrinkled transversely. 



C. Europsea. Fig. 200 ; n. s. 

 moneta.* 



Ovulum (Lamk.) . Poached Egg. Inner lip smooth. 



O. acuminatum. 



patulum. Fig. 199 ; n. s. 



Taken alive in Cornwall by Mr. Peach. (See Eejy. Brit. 

 Assoc; 1844.) 



