10 VR. P. P. CARPKN'iKR ON THE SHELLS OF PANAMA, 



170. Plevrotoma diipHcata = brillia d. 



171. Plevrotoma e.icentricu=^DnUia 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 ty})es in Mns. Cuming, do not always present satislactory 

 diagnostic characters. 



1 72. Fleurotoma exigua==Mavgelia e. I could not discover "the 

 rest in pairs." 



173. Pleurotoma yemmuJosa^Manyelia g. 



174. Pleurotohia gi-andhiiacnlata^^DriUia g. 



175. Pleuvoiovia incrassata = Br'dlia i., M. 4.59. The collection 

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

 fessor's collecting. 



176. Pleurotoma 7iigerrima^Drillia 71. 



\77. Pleurotoma obeIiscus=^Drillia 0. Very worn and doubtful. 



178. Pleurotoma oUvacea. Closely resembles P. funiculata, 

 M. 457. 



1 79. Pleurotoma pallida =Drillia p, 



180. Pleurotoma rigida = Clathurella r. 



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

 Drillia 7-udis, being distinguished by white spots on the knobs : 

 V. M. 460. 



182. Pleurotoma rusfica=: Drillia aterrima, var. melchersi, M. 

 401. 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. AdS. 



18.5. Pletirotoina, sp. a. A small, dark, purple-brown Mangelia, 

 of the levfroyi type. 



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

 probably a Cithara. 



187. Mangelia, 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 Beta turricula. 



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

 posterior notch ; s])ira*lly striated, with rather sharp ribs. 



191. Mangelia neglecta. Of the "elevated spiral line on the 

 niddle of the whorls" J could discover no trace, except of colour. 

 It is therclbre probable that it = ili. acuticontata, M. 4/3. 



184 



