NON-MARINE MOLLUSCS OF SURINAM. 35 
*84, DORYSSA GUYANENSIS nov. sp. (fig. 12). 
Shell cylindro-conic, rather thin, olivaceous with dark 
spots and stripes, on the last whorl arranged somewhat 
regularly, forming longitudinal streaks. Apex decollated, 
whorls flat, very faintly sculptured with irregular spiral 
lines, decussated by inconspicuous growth-wrinkles. Last 
whorl (of the apparently immature specimens) carinated ; 
its base sculptured with spiral wrinkles. Columella twisted. 
Type in the Leyden Museum. 
Surinam. Coppename-Expeditie. 
Lucie River. Corantijn-Expeditie. 
This species, of which only two specimens (both very 
likely immature ones) are collected, is very much resem- 
bling the preceding species. It can however easily be 
distinguished by its different sculpture and colouring, and 
particularly by its less conic shape. It is intermediate in 
shape between D. kappleri and D: hohenackeri, the latter 
species being still more cylindrical. 
85. DORYSSA HOHENACKERI Phil. 
Melania hohenackeri, Philippi, Zeitschr. f. Malakozool. VIII, 
1851, p. 82. 
Doryssa hohenackeri Phil., Brot, Syst. Conch. Cab., Ed. nov., 
Band I, Abt. 24, 1874, p. 349, T. 35, f. 6. 
Philippi, 1851, p. 83. Mountain-brooks in Surinam. 
Martens, 1873, p. 218. Surinam. 
Brot, 1874, p. 349. Surinam. 
The Gonini-Expedition collected some specimens of this 
species on Mount Cottica in French Guyana. 
?86. MELANIA DECOLLATA Lam. 
Melania decollata, Lamarck. Hist. nat., 1835--45, n°. 9. 
Brot, Syst. Conch. Cab., Ed. nov., Band I, Abt. 24, 
Asis ip. 70; Tt, 40) 40a. 
Kappler, 1887, p. 20. Surinam. 
Like Brot remarks, the locality „Guyana’’, given for this 
species, is most likely due to the fact that there exists 
Notes from the Leyden Museum, Vol. XXXVI. 
