1927] Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 201 
Lanistes (Leroya) stuhlmannt Durvuis anp Purznys, 1901, Ann. Soc. Malacol. 
Belgique, XX XVI, Bull. Séances, p. lx; 1923, Ann. Soc. Zool. Belgique, LIII, (1922), 
p. 78 (with var. unicolor Dupuis and Putzeys, p. 79, from Stanleyville). 
Type locality: between Uvira and Kasongo (Grauer Coll.); Germain (1916) 
makes this two localities instead of one as it was originally intended for. Lualaba 
River at Nsendwe and at Stanley Falls (Dupuis Coll.). 3 
Stanleyville, in forest brooks, several hundred specimens, together 
with L. procerus langi, L. nsendweensis, and Pila congoensis (Lang and 
Chapin Coll.). 
This species is well distingwiched from all others of the region by the 
solid compact shell, wholly imperforate at all stages of growth seen, and 
more or less strongly angular at the shoulder. 
Immediately below the suture there is at first a short, steep descent, 
a slight furrow, then a subhorizontal flattening bounded by an angle or 
slight keel. This is strongest on the penult whorl, generally weaker and 
sometimes almost rounded near the mouth. The surface has but little 
gloss, and under a lens often shows faint, close spiral strie, wanting on 
many examples. The color is light brownish-olive or isabella, nearly 
uniform or having deep chestnut-brown bands. The columella is heavily 
calloused, white. It is bounded outwardly by a narrow, flattened, black- 
ish, crescentic area defined outwardly by an angle. The width of this 
area varies individually. Interior whitish, sometimes banded. The 
early whorls are very deeply eroded, even in the youngest seen, 13.5 mm. 
long. | 
Length, 24.0 mm.; diameter, 24.0 mm. 
The operculum is rather narrow, the width from 57 to 60 per cent 
of the length, the columellar outline weakly sigmoid, the outer regularly 
arched. It is strongly concave externally, the greatest concavity near 
the columellar side. The scar is shaped like the operculum and occupies 
about half the total width. Itis soncenimcally, plicate, with some irregular 
radial rugosity. 
The distinction between L. graueri and L. qua is certainly 
not very conspicuous, and Thiele, who had both before him, subsequently 
considered them as doubtfully distinct. In the absence of specimens of 
stuhlmanni for comparison, we prefer to use the name grauerz for the 
form of the Belgian Congo. Dupuis and Putzeys in a recent paper [1923, 
Ann. Soc. Zool. Belgique, LIII, (1922), pp. 78-79], having examined a 
long series from Stanleyville, consider grauert to be synonymous with 
stuhlmanni and doubtfully distinct from farlert. They propose callin 
bandless specimens var. wnicolor. 
