32 NON-MARINE MOLLUSCS OF SURINAM. 
Martens, 1858, p. 177. Surinani. 
Martens, 1873, pp. 209, 216. Surinam. 
yon Martens, 1858, says that he does not know if the loca- 
lity ,Surinam” is right. He has found however the same 
species in ,Schneckenerde” from Venezuela. 
* 79. DoRYSSA LAMARCKIANA Brot. 
Doryssa lamarckiana, Brot, Amer. Journ. of Conch. VI, 1870 
—71, p. 305; Syst. Conch. Cab., Ed. nov., Band I, 
Abt. 24, 1874, p. 344, T. 35, f. 1, 1a. 
Upper Nickerie. ten Kate. 
Corantijn. ten Kate. 
Surinam. Saramacca-Expeditie. 
Lucie River. Corantijn-Expeditie. 
* 80. Doryssa ATRA Rich. 
Bulimus ater, Richard, Act. Soc. Hist. Nat., 1792, p. 126. 
Doryssa atra Rich., Brot, Syst. Conch. Cab., Ed. nov., Band 
I, Abt. 24, 1874, p. 342, T. 35, f. 7. 
Lenabari. Gonini-Expeditie. 
Lawa. Gonini-Expeditie. 
Kast Surinam. Tapanahoni-Expeditie. 
Martens, 1873, pp. 207, 216. Surinam. 
Brot, 1874, pp. 343, 344. Marowijne. 
Kappler, 1887, p. 203. Surinam. 
The specimens of this and the preceding species, col- 
lected by Mr. ten Kate and by four Surinam-Expeditions 
have much puzzled me, and it is still with some reserve 
that I have ranged them under one species or the other. 
Many specimens being not yet fully developed, and having 
not formed their definitive peristome, it becomes still more 
difficult to separate them. One of the D. lamarckiana from 
the Corantijn is agreeing very much with Brot’s fig. 1; 
the D. atra specimen, collected in the Lawa River, is 
much like Brot’s fig. 7. After having carefully compared the 
fullgrown specimens in the Leyden Museum, I separated them 
according to the following key: 
lamarckiana atra 
shape | cone shorter and | cone more slender 
wider and elongated 
Notes from the Leyden Museum, Vol. XXXVI. 
