ZOOLOGY OF FERNANDO NORONHA. 
485 
added at one end only, thus producing a long narrow operculum- 
MM. Cross and Marie * have also noticed, in respect of C. impe- 
rialism C. lividus, and C. rattus, that the nucleus of the operculum 
is subapical, and doubtless it lias a similar position in other 
species. The description of the operculum therefore as usually 
given in manuals and other works requires modification, and the 
nucleus should be termed apical or subapical. 
3. Conus daucus, Hwass. 
Hab. Barbados (Mas. Cuming) ; St. Domingo and Guadaloupe 
( Kiister ) ; Cuba and Martinique id' Orbigny). 
The single beach-rolled specimen has a very strongly marked 
double zone of brown spots upon the middle of the bocly-whorl. 
With this species I unite C. mammillaris , Green, C. castus, Reeve 
(not C. castus of WeinkaufF), C. archetypus , Crosse, and C. san- 
guinolentus of Reeve. 
C. Reevei, Kiener, placed by WeinkaufF f in the synonymy of 
this species, is quite a distinct shell, which I regard as the same as 
C. piperatus , Dillwyn, not C. piperatus, Reeve, which, as stated 
by WeinkaufF, is the same as C. erytlirceensis of Beck. 
4. Pleurotoma (Crassispira) euscescens, Gray. 
1843. Pleurotoma fuscescens, Gi'ay, Reeve, Con. Icon. fig. 125. 
1845. Pleurotoma nigrescens, Gray, Reeve, l. c. fig. 235. 
1845. Pleurotoma paxillus. Reeve, fig. 285. 
1850. Pleurotoma solida, C. B. Adams, Contrib. Conch, vol. i. p. 61. 
Hab. Cuba (d' Orbigny) ; Jamaica (C. B. Ad. for solida)-, St. 
Vincent ( Reeve for nigrescens) . 
PI. nigrescens and PI. paxillus differ from the typical form of 
the species in being very much smaller, PI. solida being inter- 
mediate in size. 
In his ‘ Manual of Conchology ’ (vol. vi. p. 193) Tryon states 
that PI. nigrescens of C. B. Adams and PI. nigrescens of Gray 
are the same species. Having types of the former received from 
Adams and Gray’s types also for comparison, I can state that 
beyond a doubt they are distinct. PI. cuprea, Reeve, is rather 
an unsatisfactory species at present, and I am rather inclined to 
believe that, as suggested by Tryon, it will prove to belong to 
this species also. 
* Journ. cle Couch. 1874, pp. 333-359. 
t Conch. -Cab. p. 312, uo. 53. 
