DR. P. P. CARPENTER ON THE SHELLS OF PANAMA. » 



143. Mitrex vibcx. This Peruvian species also probably belongs 

 to the Purpuric! group. 



144. Murex vittatus=Muricidea v. 



145. ( = M. 638), 146 ( = M. 579). Stent. 



14 7. Fusits bclhis, C. B. Ad. This is a pretty little shell, resem- 

 bling a young Mefii/a, and is probably one of the s))ecies assigned 

 with doubt to that genus, M. 619-622, or to Fusits, M. 642. I should 

 erase the words, "some of which are varicoid" (referring to the ra- 

 diating ribs), as my glass did not enable me to detect a single one. 



148. Fasciolaria granosa. A minute specimen is of the size and 

 general appearance of the fry of Chri/soilomus antiquus, with one and 

 a half irregular nuclear whorls. An adult has its operculum broken 

 and mended from a subcentral nucleus — a mode of proceeding which 

 I have now observed in such a multitude of species belonging to dif- 

 ferent families of Proboscidifers and Toxifers that 1 venture to assign 

 it as the original type of their opercula, from which tlie special 

 family forms are modifications of high development. Of the spiral 

 Rostrifers there is not yet sufficient evidence to speak*. 



149. Turhinella ccestus, M. 581. 



150. Turbinella custanea = Latirus c. 



151. Turbinella cerata^Latirus c, M. 532. 



152. Turbinella radis=Latirus r. 



153. Turbinella spadicea^= Latirus s. 



154. Cancellaria affinis. Very closely allied to C. urceolata, 

 M. 445. 



155. 156, 157 ( = M. 446), 158, 159. Stent. 



160. Cancellaria pygmcea is simply a young specimen of C. §c^ 

 niostoma, no. 157. 



161, 162. Stent. 



163. Pleurotoma aterrima = Drillia a. 



164. Pleurotoma atrior. This is a fine specimen, not quite ma- 

 ture in the lip, of Drillia aterrima, var. melchersi, M. 461. 



165. Pleurotoma bicanalifera^^Clathurella b. 



166. Pleurotoma collaris=Drii'lia c. 



167. Pleurotoma concinna=^Cithara c. 



168. Pleurotoma corrugata=^ Drillia c. 



169. Pleurotoma discors=Drillia d. Probably a finely developerl 

 variety of aterrima. 



* When at Charleston, S. C, I had an opportunity of examining many vei-y fine 

 specimens of the giant Fasciolaria, so seklom seen in this country, of which a 

 broken specimen in my collection measures 20 in. In sculpture, colour, ami 

 general appearance some were so very like F. princeps, M. 584, that 1 wis tempted 

 to consider the latter a degraded iocai var»e<v, nil i found the opei^ulum, .thicU 

 is destitute of the singular groaviug of the Gulf species. 



183 



