142 Bulletin American Museum of Natural History [Vol. LIIL 
Specimens from Dupuis, labelled forskaliz, and evidently what he 
described as Pyrgophysa nyangweensis, agree with those from Bambili. 
Numerous forms close to forskalii in contour have been described, 
and in the series seen there appear to be several forms of at least sub- 
specific rank in south and northeastern Africa. 
Other Species of Pyrgophysa Recorded from the Belgian Congo 
Bulinus (Pyrgophysa) lamellosus (Roth) 
Isidora lamellosa Rotu, 1855, Malakoz. Blatter, II, p. 49, Pl. 1, figs. 14 and 15 
(type locality: Nile River). 
Bullinus forskali var. lamellosa Roth. DaurzENBERG AND GERMAIN, 1914, Rev. 
Zool. Afric., IV, 1, 1914, p. 44. 
According to E. v. Martens (1897, ‘Deutsch Ost Afr., IV, Beschalte Weichth.,’ 
p. 141), this was based upon a young stage of B. forskalii. Dautzenberg and Germain 
(op. cit.) have recorded this form from Lake Kisale at Kikondja and the Lualaba 
River at Muyumbwe (in 9° 8.) (both J. Bequaert Coll.). 
Bulinus (Pyrgophysa) scalaris (Dunker) 
Physa scalaris DuNKER, 1845, Zeitschr. f. Malakoz., II, p. 164 (type locality: 
Benguela). 
Bulinus scalaris DUNKER, 1858, ‘Ind. Mollusc. Guin. Infer.,’ p. 8, Pl. 11, figs. 
5-6. 
Pyrgophysa scalaris Dunker. DauTzENBERG, 1890, Mém. Soc. Zool. France, 
LL, pyle, Pl. 1, fies. 2e.and) 120. 
Physa (Pyrgophysa) scalaris Dunker. GrrMatn, 1905, Bull. Mus. Hist. Nat. 
Paris, po; 290. 
Physa (Pyrgophysa) dunkerit GERMAIN, 1905, Bull. Mus. Hist. Nat. Paris, p. 456, 
footnote (new name); 1908, ‘Rés. Scientif. Voy. Afrique Foa,’ p. 640. 
Dunker’s Physa scalaris did not need to be renamed since it is not Pe apie’ by 
‘“‘Physa scalaris Jay.’’ That species was described as Paludina scalaris and is not now 
placed in Physa, but in Planorbis. 
Lake Tanganyika: at the southern end (Foa Coll.). 
Puysopsis Krauss 
Physopsis Krauss, 1848, ‘Stidafrik. Mollusk.,’ p. 85. Monotype: Physopsis 
africana Krauss. 
Shell short or broadly ae with short and often flattened spire and elongate- 
ovate aperture. The columella bearing a spiral cord, obliquely or abruptly truncate 
below. 
This genus is only known from Africa and Madagascar. The species 
_ are few and mostly ill-defined. Connolly (1925, Trans. Roy. Soc. South 
Africa, XII, 3, p. 190) treats Physopsis as a subgenus of Isidora, stating 
that H. Watson did not find sufficient ground for generic distinction in 
the anatomy. | 
