889 



173. Cerithium subcarinatum (pi. clxxxvi. f. 287), Nobis. 



Cerith. testa parva, tavi, fusco-nigricante, longitudinaliter cos- 

 tata, subtus spiraliter bicarinata ; apertura bicanaliculata ; labio 

 externo paululuin producto ; canali brevissimo, profundo. 



A small, dark brown shell, which is smoothly ribbed at the 

 upper part and shows two obtuse keels at the lower part of the 

 whorls. New Zealand, T. Hart, R.N 



174. Cerithium scalariforme (pi. clxxxvi. f. 290), Say? 



Cerith. testa pyramidali, acuta, fusco-nigricante, in medio an- 

 fractuum albo-fasciata, longitudinaliter distanter costata, subtus 

 unicarinata ; anfractibus duodecim, ventricosis; apertura subex- 

 pansa; labio externo antice producto. 



A pretty little species, with distant ribs and distinct rounded 

 whorls. It has a keel at the lower part. Florida. 



175. Cerithium costatum (pi. clxxxvi. f. 291, 292), Wood, 

 (Strombus), 43. C. Lafondii, MicJiaud, Kiener, Sp. Gen. Coq. 

 pi. 24. f. 3. C. ambiguum et servilis, C. B. Adams. 



Cerith. testa, parva, acuta, fusca, spiraliter striata, longitudina- 

 liter crebrisulcata ; anfractibus numerosis, ventricosis, ultimo sub- 

 tus unicarinato ; apertura expansa. 



Resembling C. scalariforme, but smaller, with the ribs more 

 numerous and crossed by spiral striaj. Jamaica. 



176. Cerithium Rissoideum (pi. clxxxvi. f. 289), Nobis. 



Cerith. testa fusco-caerulescente, pyramidali ; anfractibus ro- 

 tundatis, oblique albo-costatis, infra spiraliter carinatis ; labio ex- 

 terno, crasso, expanso, sinuato. 



Narrower than C. Montagnei, with less expanded aperture, and 

 the whorls prettily ornamented by regular bluish-white ribs. Mr. 

 Cuming's collection. Locality unknown. 



177. Cerithium plumbeum (pi. clxxxvi. f. 293), Nobis. 



Cerith. testa parva, elongata, plumbea, spiraliter striata, longi- 

 tudinaliter vix costata ; anfractibus decern, subrotundatis, gradatim 

 crescentibus ; apertura ovali. 



A pretty little Australian species, of which several specimens 

 are in Mr. Hanley's collection ; over a brown ground-colour there 

 is a pretty plum-like bloom. It is spirally striated. 



178. Cerithium pauxillum (pi. clxxxvi. f. 294), A. Adams, 



