10 1»R. 1'. I'. CARPKNI KR <IM TlIK SHKLLS OP PANAMA. 



170. I'leurotoma (hiplicat<i=: hrillia d. 



171. PUurctoiiui ejieurrnu=.i)iiltta e. I cannot I'lidorsc this 

 and some other determinations ol" critical species of Pleurotoniids, 

 not bein|; able to rtniove the specimens for comparison with tNpes. 

 Even the ty})es in Mus. Cuming, do not always present satislaetory 

 diagnostic characters. 



1 72. I'/eiirotoma exiyuu=Muii(jelia e. I could not discover "the 

 rest in pairs." 



1 73. I'Ifurotomu ffemmufosa=Man(/elia g. 



1 74. Pleurototiia tjrandiinaculata = Drilliu g. 



17.T. Pleuroloma iticrassiifa=:Drillio i., M. 4.")9. The collection 

 contains I). luctuosa, M. 4(J7, as from Panama, but not of the Pro- 

 fessor's collecting. 



170. Pleurotoma nigerrma = DriUia n. 



177. Pleurotoma ofjeliscus=Drillia o. Very worn and doubtful, 

 17H. Pleurotoma olivacea. Closely resembles P. J'uniculata, 

 M. 4.57. 



1 79. Plcurofoiiia j)alli<lu = DriUia p, 



180. PleiirvtoMU rigUla = Cl(ithurella r. 



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

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

 V. M. 4(30. 



182. Pleurotoma riistica = Drillia aterrima, var. vtelchersi, M. 

 401. These specimens being very worn, their specific identity with 

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

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

 satisfactorily distinguished. 



183. Pleurotoma striosa=DriUia s. 



184. Pleurotoma zomdata = Drillia 2., jNI. 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 Dapknella. 



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 = Ai. acuticostuta, M. 4/3. 



184 



