190 Bulletin American Museum of Natural History (Vol. LIIT 
In the immature stage (diameter, 10 to 13 mm.), the form 1s more 
globose, nearly as high as wide (length, 12.5 mm.; diameter, 13.5 mm.). 
There is a strong angle, or even for part of its length, a carina above, on 
the second and third whorls, then becoming rounded. This angle 1s 
much nearer the suture than in typical congicus. There is also a distinct 
umbilical cord. The surface below the angle has six or eight spiral 
cuticular threads. On the last whorl, when not rubbed, such spaced 
threads continue over the whole surface, though smaller and disappear- 
ing with growth. This structure of the cuticle is not seen in equally 
young, well-preserved L. nsendweensis. 
In the fully adult stage this form resembles L. nsendweensis by the 
loss of its superior carina. The immature stages, however, show rela- 
tionship to L. congicus which occurs farther down the river. 
Lanistes congicus var. schepmam C. R. Boettger 
Lanistes congicus. var. schepmani C. R. Barrer, 1913. Ann. Soc. Zool. Malacol. 
Belgique, XLVII, (1912), p. 104. 
Lanistes congicus var. ScuerMAN, 1891, Notes Leyden Mus., XIII, p. 111, Pl. 
vit, figs. la-c and 2a-c. 
Meladomus congicus W. Koseur, 1912, in Martini and Chemnitz, ‘Syst. Conch. 
Cab., n. F., I, Ampullariide,’ Pl. xxx, fig. 1 (not the other figures). 
Type locality: Landana (Petit Coll.). 
Lanistes nsendweensis (Dupuis and Putzeys) 
Plate XVIII, Figures 6-10 
Lanistes libycus var. nsendweensis DuPpuIs AND Purzgys, 1901, Ann. Soc. Malacol. 
Belgique, XXXVI, Bull. Séances, p. lvi, fig. 27. C. R. Barremr, 1913, op. cit., 
XLVII, (1912), p . 104. 
Meladomus nsendweensis Dupuis and Putzeys. Kospgrtut, 1912, in Martini and 
Chemnitz, ‘Syst. Conch. Cab., n. F., I, Ampullariide,’ p. 41, Pl. xxvii, figs. 11 and 
12. 
Lanistes foat GERMAIN, 1905, Bull. Mus. Hist. Nat. Paris, p. 256; 1908, ‘Rés. 
Scientif. Voy. Afrique Foi,’ p. 671, figs. 24 and 25; 1908, in A. Chevalier, ‘L’ Afrique 
Centrale Francaise,’ p. 536. 
In the Lualaba at Nsendwe, Nyangwe, and Kasongo (Dupuis Coll.; type locality 
not designated). L. foai was described from the ‘‘ Upper Congo ’ (Foa Coll.). 
Tshikapa (H. Schouteden Coll.). Medje, 1 specimen; Stanleyville, 
several hundred specimens (Lang and Chapin Coll.). Aruwimi River at 
Djali (below Banalia) and at Panga; between Ankoro and Kikondja 
(J. Bequaert Coll.). Hemptinne St. Benoit (Callewaert Coll.). 
The shell is rather solid, decidedly wider than high, openly umbilicate, 
generally not angular around the umbilicus, but sometimes distinctly so; 
flattened and slightly excavated below the suture, the depressed zone 
