61 



Cerithium aduncum. Testa solida, distorta, acuminato-con- 

 ica, leviuscula, fills tenuibus cincta, luteo-cinerea, fusco-tincta : 

 spira acuminata, anfr. 9 planis, sutura vix discretis, ultimo gib- 

 boso, valde deflecto : apertura angusta, callosa, in canalem 

 adscendentem producta ; labro crasso, simplici ; fauce livido. 

 Long. 1 ; lat. § poll. Hab. Mindanao. 



This smooth, solid, dusky species is plainly marked by its 

 peculiarly distorted form, the last whorl being so flexed upon the 

 others that its ventral outline is straight, while the dorsal outline 

 is remarkably arched. 



Cerithium irroratum. Testa ovalo-conica, transversim stri- 

 olata, fusco-nigricans, punctis elongatis cinereis irrorata : spira 

 conica, anfr. 7, planulatis, longitudinaliter undulatis, ultimo 

 dimidiam testa? superante ; sutura obsoleta. : apertura rotundato- 

 elliptica; labro declivi ; canali brevissimo ; fauce livido, albo- 

 fasciato. Long, f ; lat. | poll. Hab. ? 



Generally resembling C. ocellatum, Lam., which has a median 

 tuberculated angle on each whorl and an excavated sutural region, 

 while this has a regularly curved outline and folded surface. 

 The pale spots are less numerous, and the proportions of the 

 aperture are different. 



Cerithium sordidueum. Testa elongata, rubiginoso-albida, 

 costellis numerosis et filis volventibus alternatim majoribus reti- 

 culata : spira turrita, acuminata, anfr. 11 planulatis, ultimo vari- 

 coso, granuloso ; sutura profunda : apertura ampla, ovato-rotun- 

 data ; labro crenulato, extus incrassato, rufo-tincto ; rostro atten- 

 uate, valde recurvo ; fauce alba. Long. ^ lat. ^ poll. Hab. ? 



In its general structure, especially in the development of the 

 last whorl, this may be compared with C. columna, Sowb., but it 

 differs entirely in sculpture, its beak is very much shorter, and it 

 is very much smaller. 



Cerithium invaginatum. Testa elongato-turrita, sordide 

 alba, ad apicem et interdum ad rostrum rufescens, filis tenuibus 

 cincta ; spira anfr. 10- 12 angulato-convexis, superne tabulatis, 

 inferne constrictis, nodoso-plicatis et concinne lamelloso-rugosis, 

 ultimo carinato : apertura subquadrata, alba; rostro gracili, 

 recurvato. Long. £, lat. £ poll. Hab. Feejee Islands. 



A very peculiar species. The tuberose whorls narrowed an- 



