CIRRHIPEDA. 



41 



peduncle is affixed. Animal compressed. — 

 1 (?) species. 



These animals are always found fixed to the 

 bottom of a deep irregular cavity in limestone, 

 perforated by themselves.* 



19. Anatifa.| — Shell compressed at the 

 sides, composed of five valves, which are con- 



tiguous and unequal; the two side-pieces are 

 rather striated, the others small, and all are 

 united together by a thin membrane. Animal 



* Reeve's Conchologia Systematica, 

 f Called by Leach Pentelasmis, 



