202 RAP AN A. 



the latter name, I do so likewise. The species is exceedingly 

 variable, but in all stages presents a sloping shoulder to the 

 whorls. This shoulder is defined by a line of tubercles, which 

 are open scales in the finest examples, but become mere rounded 

 knobs in more worn specimens. The inferior revolving ribs are 

 also garnished with either tubercles or scales. 



C. MURICATA, Hinds. PL 63, fig. 335. 



Shell yellowish (dead). Length, (> inch. 



P< i in i in a ; in mud, 19 fathoms. 



A single specimen dredged by Hinds. It is so exactly like a 

 very young C. rugosa that the widely distinct locality appears 

 to be the only distinctive feature. It was described as a Trophon, 

 but the specific name in that genus being pre-occupied by Montagu, 

 P. P. Carpenter proposed to change its name to Trophon Hindsii. 



C. MURICINA, Blainv.,= Ricinula undata, Chernn. 



A number of authors have assigned this species erroneously to 

 Cnma ; among them Pease,* who quotes among the synonyms 

 P. tMrbinata, Bl., which = Cnma carimfera, Lam., and Pvrpitra 

 foUacea, Conr., which = Bhizochilun. 



C. COSTATA. BL, = Khizochilii*. 



Onus itAPANA, Schum. 



This well-characterized group includes a few species usually 

 found upon coral reefs in tropical seas, and probably living upon 

 the coral polyps. 



The Fusus quadricostatus of Say (PL 64, fig. 341), a common 

 American tertiary fossil and very remarkable shell, is referable 

 to this genus : Conrad has formed for it his genus Ecphora. 



R. BEZOAR, Linn. PL 63, figs. 333, 337 ; PL 64, figs. 339, 340. 



Shell spirally ribbed or striate ; growth-lines smooth or sca- 

 brously foliated ; shoulder of whorls flattened. Light brown, 

 usually longitudinally flamed and obsoletely spirally spotted with 



* Am. Jour. Conch., iv, 111. 



