FISSUR.ELUD.fl:. 187 



antice attenuata, alba, purpureo interruptim radiata, striis scabris 

 numerosis et costellis catenseformibus rarioribus extantibus radiata, 

 intus alba ; rnargine maculate Obs. This beautiful shell is dis- 

 tinguished by scabrous stria? with noduliferous or chain-like ribs 

 at intervals. 



22. maxima (f. 8, 9), Soirb. — Magna, ovali, antice paululum 

 attenuate, crassa, costis Isevibus undulatim nodosis radiata, fulva, 

 purpureo radiatirn fasciata ; margine undulatim crenulato, intus 

 albo, calloso ; foramine ovali, ceutrali, intus calloso. Obs. A large 

 well-known shell, broadly rayed with purple bands and thick undu- 

 lated ribs. F. 9 is a singular specimen, in which the fissure is 

 nearly closed by shelly deposit. See F. Bridgesii for a case of 

 entire closure. 



23. concinna (f. 4, 178, 206), PJiilippi. — F. maxima simili, 

 sed multo magis angusta ; costis nonnunquam magis nodosis. 

 Obs. Yery probably a variety of F. maxima, but so constantly 

 narrower in all stages of growth as perhaps to merit distinction. 

 The smaller specimens are much more rugose, and the surface un- 

 dulated. M. Hanley's larger specimen is as smooth as F. maxima. 

 I cannot doubt the identity of Mr. Eeeve's HomJurasensis. 



24. stellata (f. 82), Rve. — F. maxima simili sed parva ; 

 radiis prope apicem interruptis et sagittatis. Obs. Although this 

 little shell appears full grown, it presents a very close miniature re- 

 semblance to its gigantic ally. Near the apex, the purple rays 

 are interrupted and arrow-headed. 



25. Cumingii (f. 5, 132), live. — Lata, ovali, depressa, antice 

 paulo attenuate, purpureo, vel rubro radiata, lineis elevatis scabris 

 costellata, intus alba, purpureo late marginata ; foramine ovali. 

 Obs. Broad, depressed, brownish, purple or purple-rayed, with 

 scabrous stria? ; a very broad purple margin. The young speci- 

 men, f. 132, is Mr. Hanley's. 



26. lata (f. 13), Sowb. — Late ovali, elevata, lutea, fasciis pur- 

 pureis et costellis moniliferis radiata,; foramine ovali. Obs. A 

 much more elevated shell than the last, with beaded riblets. 



27. costata (f. 15, 205), Lesson. — Latissiraa, pallide fulva, 

 obscure radiatirn fasciata, depressa, antice paululum attenuata, 

 costellis irregularibus moniliferis radiata, intus alba ; margine lato, 

 pallid! subviridi ; foramine parvo, ovali. Obs. The irregularity 

 of the nodules, and the less conical form, independently of colour 

 distinguish this from the preceding. F. rurfis of Desliayes, may 



