348 DR. p. p. CARPENTER ON THE SHELLS OF PANAMA. [JunC 23, 



170. Pleurotoma duiMcata=Brillia d. 



171. Pleurotoma excentrica=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. 



172. Pleurotoma exigua=^Mangelia e. I could not discover "the 

 rest in pairs." 



1 73. Pleurotoma gemmulosa-^Mangelia g. 



174. Pleurotoma grandimaculata'=J)rillia 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=I)rillia n, 



177. Pleurotoma obelisc2(s— Drillia 0. Very worn and doubtful, 



178. Pleurotoma olivacea. Closely resembles P. funiculata, 

 M. 457. 



179. Pleurotoma pallida =I>rillia p. 



180. Pleurotoma rigida — Clathurella r. 



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

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

 V. M. 460. 



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

 461. These specimens being very worn, 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=: Brillia s. 



184. Pleurotoma zonulata= Brillia 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. Mangelia, sp. c. A young Baphnella. 



188. Mangelia, sp. d. A very worn, black shell j 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 Brillia, with distinct 

 posterior notch ; spirally striated, with rather sharp ribs. 



191. Mangelia neglecta. 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=iH. acuticostata, M. 473. 



