1927] Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 228 
The specimens figured (Fig. 21) are from Cape Palmas (R. Swift 
collection). The aperture is broadly ovate rather than circular. They 
measure: 
lea 5.0 mm.; diameter,3.20 mm.; 7 whorls. 
5.8 i 3.25 : Bieta 
In the collection of the Academy of Natural Sciences of Philadelphia 
there are three lots of this species labelled ‘“‘Cape Palmas,” received from — 
T. Bland, R. Swift and C. M. Wheatley; in all 37 specimens. Possibly 
all of these were from one source. 
Fig. 21. Potamopyrgus ciliatus (Gould). Cape Palmas. 
No subsequent record of this species or genus in Africa has been 
made. Dr. Gould remarked upon the resemblance of this species to 
P. corolla which he had previously described, and pointed out their 
differences. Frauenfeld examined specimens ‘‘in Cuming’s Sammlung 
aus Liberia, als alvata Gld.' aus Afrika, und gleichfalls aus Neuseeland. 
Ich kann die aus Afrika stammenden nicht von den neuseelaéndischen 
trennen.”’ Fischer’s Paludestrina salleana? was said to be from New 
Zealand, on the authority of Sallé; it appears quite indistinguishable 
from P. ciliata (Gould). Suter? ranks P. salleana as a subspecies of P. 
corolla (Gould). He states that “‘the only specimens with a slight chor- 
date carina below the series of spines are from Lake Manapouri.’’ His 
figure shows a form which is only subangular below the spines. 
On the whole, it appears likely that Gould’s African locality was 
erroneous; but his well-known accuracy, as well as the circumstantially 
recorded locality and collector, cause us to suspend judgment until this 
locality can be searched again. 
1 4lvata’’ was evidently Frauenfeld’s taint of a poorly written cilzata. 
21860, J de Conchyl., VIII, p. 208, Pl. rv, : 
oH Suter, 1913, ‘Man New Zealand Moll.,’ a 233: 1915, op. cit., Atlas, Pl. xrv, fig. 4. 
