CERITHIUM.— Plate XVI. 



broad laminated, outer lip thickened and crenulated 



witbiu, caual oblique, short. 

 Menke, Synopsis. 

 Hab. AVest ludies. 



Species 114. (Mus. Cuming.) 



Cekithium bj.ticum. Cerith. testa angmld, mhcylin- 

 draced, varkosd, fulvd ; anfractibus vix inflatis, cosiis 

 fascis, planatis, angmtis, et lineis elevatis, crenalis 

 ■punctatis, alternatini cinctis ; aperturd pm~cd, canali 

 brevi. 



Tht. dakk-bkown Cerithitjm. Shell narrow, rather 

 cylindrical, varicose, fawn-coloured ; the whorls 

 slightly inflated, encii-cled with dark-brown, flat, 

 nan-ow ribs, and elevated, crenidated, punctured lines 

 alternately; aperture small, canal short. 



Pease. 



Hab. Sandmch Islands. 



The general dark-brown appearance of this pretty little 

 shell is produced by the flattened ribs, which are ven- 

 dark and distinct; between these are crenulated ridges 

 with spots between the nodules. 



Species 115. (Mus. Cuming.) 

 Cekithil'ji paxilltjm. Cerith. testa parvd, ovali, veiitri- 



cosd, fused, longitudinaUter plicatd, super pUcas spira- 

 liter tuberculatd, intei- tnbercula spiraliter siriaiis ; 

 anfractibus panels, stibveyifricosis, ultimo magna, tnber- 

 cidis mhwrihus ; aperturd ovali ; labro crasso, canali 

 breviusculd, rectiusculd. 



The little-post Cekitiuum. Shell small, oval, ventri- 

 cose, brown, longitudinally plaited, spirally tuber- 

 culated upon the plaits, spirally striated between the 

 tubercles ; whorls few, rather ventricose, the last 

 large, with small tubercles ; aperture oval, outer lip 

 thick, canal rather short, rather straight. 



Pease. 



Hab. Sandwich Islands. 



Species 116. (Mus. Cuming.) 



Cerithium Greexii. Cerith. testa' mimiid, pupaformi, 

 nigrescente ; anfractibus ventricosis, lu?tgitudinaliter 

 plicaiis, triseriatim spiraliter tuberculatis, suturd ex- 

 cavatd, ultimo infractu infra costato ; aperturd parvd, 

 columella breviusculd, crassd, canali hrevissimo, aperto. 



Green's Cerithium. Shell minute, chrysalis-shaped, 

 rather black; whorls ventricose, longitudinally plaited, 

 spirally tuberculated in three rows, suture hollow ; 

 last whorl ribbed beneath ; aperture smaU, columella 

 rather short, thick, canal very short, open. 



Gould. 



Hab. North America. 



