132 SPECIFIC 



Lister Conch. Tab. 175. Fig. 12. 



Specimen twice the size of the figure, white 

 spotted with reddish brown ; ears rough, obliquely 

 wrinkled. 



Inhabits the Indian Ocean. 



Fig. 2. O. varia. 



Shell equivalve; about 30 compressed rough 

 and prickly rays ; one ear very small. 



Lister Conch. Tab. 178. Fig. 15. 



Specimen yellow brown with darker clouds ; 

 rather convex ; rays obsoletely spinous, inter- 

 mediate spaces not striate , the smaller ear 

 spinous, the larger with wrinkled plaits and 5 spines 

 beneath. 



Inhabits the English coast. 



Fig. 3. O.fasciata. 



Shell equivalve; 20 rough rays; intermediate 

 furrows striate ; ears equal, very small. 



Lister Conch. Tab. 177. Fig. 14. 



Specimen white, pellucid gaping on both 

 sides, within finely striate ; margin crenate. 



Inhabits the Atlantic Ocean. 



