194. Bulletin American Museum of Natural History [Vol. LIII 
Length, 39.0 mm.; diameter, 39.0 mm.; 5) whorls, the apex being slightly 
eroded. 
This species differs conspicuously from L. congicus by the decidedly 
sloping zone between the shoulder keel and the suture. L. fultoni 
(Kobelt), thought to be from Lake Victoria, does not seem to differ 
materially from bicarinatus, to judge from Kobelt’s description and 
figures. The collector was not stated and perhaps the locality assigned 
may prove incorrect. 
Subgenus MELapomus Swainson 
Meladomus Swatnson, 1840, ‘Treatise on Malacology,’ p. 340. Monotype: 
Meladomus bulimoides Swainson = Ampullaria purpurea Jonas. 
This group contains the following species: 
Lanistes adansoni Kobelt. See p. 196. 
Lanistes affinis EK. A. Smite, 1877, Proc. Zool. Soc. London, p. 716, Pl. txxtv, 
fig. 7. Lake Nyasa. 
Lanistes afjnis var. manyaranus R. Sturany, 1894, in O. Baumann, ‘Durch 
Massailand zur Nilquelle,’ p. 310, Pl. xxtv, fig. 32. Lake Manyara, Tanganyika 
Territory. . 
Lanistes ambiguus (E. v. Martens) =Lanistes olivaceus var. ambiguus KE. v. 
Martens, 1866, in Pfeiffer, ‘Novit. Conchol.,’ IT, p. 292, Pl. uxx1, figs. 3-4. Mozam- 
bique. | 
Lanistes bloyett (Bourguignat) = Meladomus bloyeti BourguigNat, 1889, ‘Moll. 
Afrique Equator.,’ p. 171. Near Kondoa, Tanganyika Territory. 
Lanistes beetigert (Kobelt) = Meladomus libycus var. betigert KoBELT, 1912, Nach- 
richtsbl. Deutsch. Malakoz. Ges., XLIV, p. 7; 1912, in Martini and Chemnitz, 
‘Syst. Conch. Cab., n. F., I, Ampullariide,’ p. 41, Pl. xxx, figs. 9-10. Gaboon. 
Lanistes deguerryanus (Bourguignat) = Meladomus deguerryanus BouRGUIGNAT, 
1889, ‘Moll. Afrique Equator.,’ p. 175. Kingani River (near Mbiki, Ukuere) and 
Makata River (an affluent of the Vuami), Tanganyika Territory. 
Lanistes ellipticus E. v. Martens. See p. 198. 
Lanistes ellipticus luapulensis Furtado. See p. 199. 
Lanistes ellipticus var. trapeztformis FurTaDo, 1886, Journ. de Conchyl., XX XIV, 
p. 150. Zambezi River (below Tete) and Cuando River. © | 
Lanistes grassett (Morelet)=Ampullaria grasseti More.et, 1863, Journ. de 
Conchyl., XI, p. 267, Pl. x, fig. 2. Lanistes plicosus E. v. Marrens, 1870, in 
Pfeiffer, ‘ Novit. Conchol.,’ V, p. 191, Pl. cuv1, figs. 3-5 (from an unknown locality). 
Lanistes martensianus “ Maltzan” E. v. Martens, 1897, ‘Deutsch Ost Afr., IV, Be- 
schalte Weichth.,’ p. 167 (as a synonym of L. grasseti). Madagascar. We have seen 
several specimens said to have come from that island and also one labeled Mozambique. 
There can be little doubt that L. plicosus v. Martens, 1879, is L. grasseti, as v. 
Martens seems to have recognized himself. But L. ovwm var. plicosus v. Martens, 
1897, is an entirely different form. 
Lanistes gribinguiensis Grrmain, 1905, Bull. Mus. Hist. Nat. Paris, p. 487; 
in A. Chevalier, ‘I’Afrique Centrale Frangaise,’ p. 534, Pl. v, fig. 15. Gribingui 
River, an affluent of the Chari, French Equatorial Africa. 
