282 Bulletin American Museum of Natural History [Vol. LITI 
Potadoma liricincta latior (J. Thiele) 
Plate XX VI, Figure 7 
Melania liricincta var. latior J. Turein, 1911, ‘Wiss. Ergebn. D. Z. Afr. Exp. 
(190 (08) EER py 2h Ply -v,, fie. 1. 
Ninety kilometers west of the southern shore of Lake Edward (type locality; 
Grauer Coll.). | 
We have not definitely recognized this form among the several 
lots of P. liricincta examined. The nearest approach to it is our P. l. 
walikalensis. A copy of Thiele’s figure is reproduced for the sake of 
comparison. 
Potadoma liricincta semperlirata, new subspecies 
Plate XX VI, Figures 10 and 10a 
Faradje (Lang and Chapin Coll.). 
The shell is rather slender with very strong spiral cords, 7 to 9 on the last whorl, 
3 on several preceding whorls, the lowest one close above the suture, the median cord 
ascending farther than the others (to the sixth whorl upward in specimens retaining so 
many). Thespirals become somewhat smaller and closer on the base of the last whorl, 
but in the long series seen there is never a plain zone below the periphery, such asis 
seen in liricincta. The color is chestnut-brown on the last two whorls, fading to honey- 
yellow or a somewhat more olivaceous tint above. All were black-coated when 
collected. As in all the forms here referred to P. liricincta, there is a callous pad on 
the inner lip near the posterior angle of the aperture. 
Length, 30.0 mm.; diameter, 11.3 mm.; length of aperture, 10.7 mm.; 644 
whorls remaining. 
Length, 28.0 mm.; diameter, 11.5 mm.; length of aperture, 10.7 mm.; 444 
whorls remaining. 
A series of over one hundred specimens shows the race of the upper 
Uele River to be quite constant, at least in the single station. The sculp- 
ture is decidedly stronger than in the typical form of that species. From 
one to three of the spiral cords ascend to the earliest whorls preserved. 
Potadoma liricincta dryas, new subspecies 
Plate XXVI, Figures 11 and lla 
Stanleyville, in a forest brook (Lang and Chapin Coll.). 
The shell is rather thin for this genus, deep olive, somewhat shiny. Therather 
long, tapering spire is composed of rather weakly convex whorls, the penult one sharply 
angular close above the suture. Sculpture of sharp but delicate spirals in low relief, 
one at the periphery, three around the columella (and in some specimens, several 
others on the base, and sometimes one above the periphery). Under the lens some 
weakly impressed spiral lines appear on the upper surface and spire, by their inter- 
section of axial wrinkles forming irregular spiral rows of oblong granules, quite 
