CONCHOLOGy. 



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Cassis cornuta. 

 C. flammea. 

 C. rufa. 

 C. achatina". 

 C. areola. 

 C. abbreviata. 

 C. saburon. 

 C. Ceylonica. 

 C. erinaceus. 

 C. tuberosa. 

 C. fascinata. 

 C. pennata. 



Cassis crumena. 



C. zebra. 



C. sulcosa. 



C. canalieulata. 



C. semigranosa. 



C. Madagascariensis. 



C. glauca. 



C. testiculus. 



C. plicaria. 



C. decussata. 



C. granulosa. 



C. pyrum. 



C. vibex. 



3. Genus Ricimila. PI. XII. 



Jlnimal. As above. 



Shell. Oval or subglobular, thick, armed with points and with 

 a depressed spire ; aperture narrow, elongated, notched, sometimes 

 canaliculated anteriorly and digitated exteriorly ; left edge more 

 or less callous ; operculum horny, oval, and transverse. Found 

 in the Indian seas. Nine living species. 



Ricinula horrida. 

 R. arachnoidea. 

 R. digitata. 

 R. aspera. 



Ricinula clathrata. 

 R. miticula. 

 R. pisohna. 

 R. morus. 



R. mutica. 



4. Genus Purpura. PI. Xil. 

 Ani7nal. As above. 



Shell. Oval, tuberculated, thick ; 'spire short, the last whorl 

 much larger than all the others united ; aperture oval, greatly 

 dilated, terminated anteriorly by a short, oblique canal notched 

 at the extremity ; the columellar edge nearly straight, covered 

 with a callosity ; operculum horny, flat, nearly semicircular, 

 with faintly marked transverse striae. Found in the European 

 and South American seas. Fifty-five species. 



Purpura Persica. Purpura Francolinus. 



P. columellaria. P. cruentata. 



