FISSURELLID/E. 185 



8. bella (f. 25), Rve. — Ovali, radiatim leviter striata, antice 

 contracta, subacuminata, concentrice griseo fasciata, fasciis pur- 

 pureis radiata, intus alba; margiue purpureo maculate), angusto ; 

 foramine oblongo, vix infra medium posito. Obs. This pretty 

 species is rather pointed in front, it has purple rays and almost 

 obsolete striae. 



9. latimarginata (f. 6,1 ,\2) ,Sowb. — Subovali, antice attenuate, 

 fulvo-purpureo radiatim striata, intus alba; margine purpureo 

 lato, vix crenato ; foramine subcentrali. Obs. In form resembling 

 Bridgesii and bella, but radiately striated, and having a remark- 

 ably broad purple border. P. 12 represents a narrower form. 



10. biradiata (f. 1, 2, 3), Frembleg. — Subovali, depressa, 

 antice attenuate, subacuminata, radiatim striata, cinerea, radiis 

 binis albis lateralibus apice decurrente ; intus alba; margine sub- 

 purpureo lato ; foramine subcentrali, medio contracto. Obs. In 

 form resembling F. bella, but of a uniform colour, excepting the 

 white rays, which are lost in adult specimens, and having a broad 

 margin instead of a narrow one. Fig. 3 represents F. galericulum, 

 which is only a contracted form of this species. 



11. Peruviana (f. 38 — 41), Lamb. — Plus minusve ovata, pos- 

 tice subcontract;!, plerumque elevata, purpureo plus minusve 

 radiata, striis elevatis graniferis radiata ; foramine subcentrali, 

 rotundo ; marginibus elevatis. Obs. Amidst the variations to 

 which this species is subject, there is a strong tendency to purple 

 radiation, granular striation, and a form elevated near the apex. 

 P. 39 is abnormally conical. After some doubt and consideration, 

 I have concluded that the more oblong and flattened form may be 

 distinguished as follows. 



12. affinis (f. 42, 179), Gray, Soivb., Con. III. — F. Peruviana 

 similis, sed magis oblonga et depressa. Obs. This less conical 

 and more oblong form is separated to avoid the extreme inconve- 

 nience of including opposite characters under the same name, al- 

 though the gradations are perplexing. 



13. clypeus (f. 63). — Ovali, depressa, costellis subnoduliferis 

 radiata, lutea rufescente, fasciis albis duabus lateralibus et fasciis 

 16 nigrescentibus interruptim sagittatis radiatim picta, intiis alba; 

 margine luteo maculis purpuras interrupto ; foramine ovali, supra 

 medium posito. Obs. In colouring and marginal character so much 

 like var. f. 40 of F. Peruviana, that it might be almost taken for 

 a specimen of that species unnaturally depressed. 



