216 MELANIIDE. 
var. 
1 Brazil ; ex ce. Prof. W. Newcomb. 
Resembles M. Brot’s pl. 39, fig. 12 c. 
Genus DORYSSA, H. § A. Adams. 
Gen. Moll. I, p. 804, 1856, type M. atra, Richard. 
1. Doryssa transversa [?]. 
Melania transversa, Lea, Zool. 1850, Guiana, 
var. subdevians, nov. [? D. subdevians, n. sp.]. 
3 Amazons; ex c. Prof. W. Newcomb [labelled “ Mel. transversa, Ro,’}. 
Long. 26, diam. 122 mil. 
Strongly decollate, three or four whorls only remaining. 
Dark-brown colour, not light as M. Brot says Reeve’s species 
always is. Longitudinal sculpture obsolete on the last whorl. 
But for its much larger size, M. Brot’s pl. 35, fig. 10 A. [D. 
devians| well represents the form. 
2. Doryssa consolidata. 
Bulimus consolidatus, Bruguiére, Enc. Méth., 1790; fide Brot=H. decollata, 
Gmelin=Hel. cireumsulcata, Busch, 1858 = Mel. scarabus, Reeve. 
3 “To cantines River,” Brazil; ex c. Prof. W. Newcomb [labelled “ Mel, 
scarabus, Rv.”}. 
Last whorl less convex than in M. Brot’s figure ; it is also less 
decollate, four whorls remaining. 
8. Doryssa aquatilis. 
Melania aquatilis, Reeve, Icon., 1859, Rio Branca, Guiana; fide Reeve 
[in “errata”] and Brot =Mel. branca, Rv., 1860, from Rio Branca. 
1 South America; ex c. G. Nevill, Esq. 
4. Doryssa subimbricata. 
Melania subimbricata, Philippi, 4d. ITI, 1851, Hab.? [not Faunus subime 
bricatus of Brot]. 
5 Brazil; ex c. Prof. W. Newcomb [labelled “ M. subimbricata, Ph, ]. 
