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



170. Pleurotoma duplicata= Drillia d. 



171. Pleurotoma excentnca Drillia e. I cannot endorse this 

 and some other determinations of critical species of Pleurotomids, 

 not being able to remove the specimens for comparison with types. 

 Even the types in Mus. Cuming. do not always present satisfactory 

 diagnostic characters. 



1 72. Pleurotoma exigua=Mangelia e. I could not discover "the 

 rest in pairs." 



1 73. Pleurotoma gemmulosa=Mangelia g. 



174. Pleurotoma grandimaculata Drillia g. 



175. Pleurotoma incrassata= Drillia i., M. 459. The collection 

 contains D. luctuosa, M. 467, as from Panama, but not of the Pro- 

 fessor's collecting. 



176. Pleurotoma nigerrima = Drillia n. 



177. Pleurotoma obeliscus= Drillia o. Very worn and doubtful. 



178. Pleurotoma olivacea. Closely resembles P. funiculata, 

 M. 457. 



179. Pleurotoma pallida = Drillia p> 



180. Pleurotoma rigida = Clathurella r. 



181. Pleurotoma rudis. It is probable that this is not the true 

 Drillia rudis, being distinguished by white spots on the knobs : 

 v. M. 460. 



182. Pleurotoma rustica = Drillia aterrima, var. melchersi, M. 

 461. These specimens being very wcrn, their specific identity with 

 P. 164 was not recognized by the Professor. One shell,^marked 

 "rustica, var.," may be the true rustica a species by no means 

 satisfactorily distinguished. 



183. Pleurotoma striosa= Drillia s. 



184. Pleurotoma zonulata = Drillia z., M. 463. 



185. Pleurotoma, sp. a. A small, dark, purple-brown Mangelia, 

 of the leufroyi type. 



186. Pleurotoma, sp. b. A slender, pure-white, ribbed shell; 

 probably a Cithara. 



187. Manoelia, sp. c. A young Daphnella. 



188. Mangelia, sp. d. A very worn, black shell; with white, 

 knobby ribs. 



189. Mangelia, sp. e. A very small, white shell; resembling a 

 young Bela turricula. 



190. Mangelia, sp./. A very small, white Drillia, with distinct 

 posterior notch ; spirally striated, with rather sharp ribs. 



191. Manaelia neolecta. Of the "elevated spiral line on the 

 middle of the whorls " I could discover no trace, except of colour. 

 It is therefore probable that it=M. acuticostata, M. 4/3. 



184 



