32 ROCHESTER ACADEMY OF SCIENCE. [Nov. 23, 



182. Strombus (Canarium) gibberulus, Linn. 



183. " " Samar, (Chemn.) Dillw. 



184. " (Conomurex) mauritianus, Lam. 



This last is a very common and a very characteristic species of 

 the region ; it is very closely allied to Strombus liihuanus, Lin.; but is 

 at once distinguished by the black deposit on the columella. 



185. Pterocera (Millipes) violacea, Swains. 



186. " " elongata, Swains. 



187. " (Harpago) rugosa, Sowb, 



The above three species were represented by a number of indi- 

 viduals. 



Family CERITHIIDiE. 



188. Cerithium nodulosum, Brug. 



189. " echinatum, Lam. 



190. " (Vertagus) asper, Linn. 



191. " " obeliscus, Brug. The smaller 

 form called by Sowerby cedo-nuUi. 



192. Cerithium (Vertagus) Kochii, Phil. Said to be quite rare. 



Family LITORINIDiE. 



193. Litorina (Melaraphe) scabra, Linn. A very common 

 species of wide distribution. 



Family CALYPTRiEIDi^. 



194. Mitrularia tectum-Sinense, Lam. 



Family XENOPHORIDiE. 



195. Xenophora caperata, Bhil. 



Family NATICIDiE. 



196. Natica marochiensis, Omelin. Very common. This 

 species, with its varieties, is found in almost every (juarter of the globe. 



197. Natica (Mamma) mamilla, Linn. 



