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



1/0. Pleurotoma dupHcata^Drillia d. 



171. Pleurotoma excentrica = DriUia 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. 



] 72. Flenrotoma exigua=Mangelia e. I could not discover "the 

 rest in pairs." 



1 73. Pleurotoma gemmulosa=^Mangelia g. 



174. Pleurotoma grandimaculata=I)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^Drillia n. 



\n . Pleurotoma obeliscus=Drillia o. Very VForn and doubtful. 



178. Pleurotoma olivaeea. 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. 4C0. 



182. Pleurotoma rust iea = Drillia aterrima, var. melchersi, M. 

 4(>1. These specimens being very worn, their specific identity' with 

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

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

 satisfactorily distinguished. 



183. Pleurotoma striosa^ Drillia s. 



184. Pleurotoma sonulata^ 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. 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 Bela turricula. 



190. Mangelia, sp./. A very small, white Drillia, 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=7li. ucuticostata, M. 473. 



184 



