119 



et fascia lutea cincta : spira turrlta, anfr. ad 10 convexis, vix 

 angulatis, et liris obsoletis cinctis, supernis plicatis, ultimo glo- 

 bose, abnormali, varice magno munito ; sutura profunda, lutea : 

 apertura rotundata, antice efFusa, baud emarginata ; labro everso, 

 polito, piceo: operculum multispirale. Long. 1^; lat. |- poll. 

 Hah. Sacramento River, California. 



Allied to C. varicosum^ Sowb. The surface, though not 

 smooth, is destitute of longitudinal ribs except near the tip ; it 

 has also a pale sutural region and a less marked canal. 



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

 ica, leviuscula, filis tenuibus cincta, luleo-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. f poll. Hah. 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 ovato-conica, transversim stri- 

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

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

 dimidiam testae superante ; sutura obsoleta : apertura rotundato- 

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

 fasciato. Long, f ; lat. ~ poll. Hah. ? 



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 sp6ts are less numerous, and the proportions of the 

 aperture are different. 



Cerithium sordidulum. 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, -^jj lat. ^ poll. Hah. .? 



In its general structure, especially in the development of the 

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



