268 MELANIIDE. 
Unfortunately not quite adult. A large, tumid form, appar- 
ently even more aberrant than the above-quoted figure, or than 
any of the varieties figured by Kobelt. 
Sub-Genus NIGRITELLA, Brot. 
Conch,-Cab, IT, 1874, type MM. nigritina, Morelet, 
55. Melania [Nigritella] guineensis. 
Melania guineensis, Reeve, Icon. fig. 142, 1860,“ Coast of Guinea.” 
var. minor. 
4 Liberia; coll. Dr, H. Dohrn (23, 93]. 
56. Melania [Nigritella] decollata. 
Melania decollata, Lamarck, Hist. 1822, Riv. dela Guyane; fide Brot = 
M. erosa, Philippi [not Less] = M. sculptilis, Reeve. 
3 La Guayra; coll. A. Morelet, Esq. 
Sub-Genus PACHYCHILUS, Lea. 
P. Zool. S. 1850, p. 179, type P. cumingii, Lea [as Genus nov.]. 
57, Melania [Pachychilus] largillierti. 
Melania largillierti, Philippi, Abb. I. 1845, Centr. America ; fide Brot. .M, 
rusticula, Busch and M. rubicunda, Reeve. 
var. intermedia, 
Melania intermedia, von dem Busch, Philippi, Abb. J, 1845, “ Lacus 
Nicarigua.” 
2 Guatemala; coll. A. Morelet, Esq. 
58. Melania [Pachychilus] conica. 
Melania conica, d’Orbigny, Hist. Nat. Cuba, 1841; fide Brot=M. nigrata 
Poey, Mém, Cuba II, 1852=M. scarabus, Rv. Icon. Hab. ?=M. 
gemella, Rv.; Icon., Cuba=M. attenuata, [Anthony], Reeve, Icon., Cuba. 
6 Cuba; exc. Dr. F. Stoliczka [ex Landauer]. 
2 Cuba; ex c. Dr, F. Stoliczka [labelled “ JZ, nigrata, Poey,’’]. 
