34 NON-MARINE MOLLUSCS OF SURINAM. 
and strongly developed ribs, vanishing on the base of the 
last whorl. Whole the surface covered by a network of 
very fine decussating lines, only seen by a strong lens. 
Last whorl not ascending. Aperture ovate, pointed at the 
suture, obtuse at the base, rather straight. Columella twisted. 
Margins of peristome joined by a rather thick, bluish callus. 
Length (decollated) 21, diam. 8, length of aperture 7, 
diam. 5 m.M. 
Type in the Leyden Museum. 
Corantijn. ten Kate. 
This species is much like a dwarf specimen of D. atra. 
The ribs are stronger than in that species, moreover they 
are very distinct on the last whorl. The shape of the 
aperture is different, the longitudinal axis being more 
oblique than in D. atra. 
* 83. DoRYssA KAPPLERI nov. sp. (fig. 11). 
Shell conic, rather thin, olivaceous with dark brown 
spots and stripes, forming interrupted spiral bands. Apex 
a little decollated, whorls flat, somewhat crisped, sculptured 
with microscopical, decussating lines. Last whorl (of the 
apparently immature specimens) carinated, with distinct 
spiral wrinkles on its base. Columella twisted. 
Type in the Leyden Museum. 
Surinam. Coppename-Expeditie. 
Lucie River. Corantijn-Expeditie. 
It is with some hesitation that I have created a new 
species for the three specimens, collected by the first and 
the seventh Surinam-Expedition, because they are appar- 
ently immature. Nevertheless I think this species will be 
easily recognized when other specimens of it might be 
collected. It has a much more conic shape than young 
specimens of D. hohenackeri. 
I have dedicated it to the memory of Mr. August Kappler, 
who lived in Surinam during about 45 years, and who has 
done much to promote our knowledge about this colony. 
Notes from the Leyden Museum, Vol. XXXVI. 
nT 
