198 Bulletin American Museum of Natural History [Vol. LIII 
nounced them his L. olivaceus var. procerus; but in these shells, asin our 
very large series from Stanleyville, the oldest shells fall far shor’ of the 
size of that form. ZL. ovwm var. elatior v. Martens is smaller with 
a relatively smaller aperture than our shells, and a more closed 
umbilicus. We conclude that in proposing a new name for this common 
race of the Upper Congo, we run less risk of error than would be involved 
in referring to it under a name not fully applicable. 
When the thin epidermis is peeled off, the underlying shell is seen 
to have a beautiful Dutch blue to madder blue color, toward the base 
becoming pale lilac and then ivory yellow; a whitish line at the suture. 
The specimens from the Luapula and Lake Kisale, in the Katanga, 
are somewhat darker than most of those from Stanleyville—brownish- 
olive to bister. Otherwise they are similar. 
Lanistes (Meladomus) procerus magnus (Furtado) 
Lanistes magnus Furtapo, 1886, Journ. de Conchyl., XXXIV, p. 147, Pl. v1, 
fig. 5. E. A. Smrrx, 1908, Proc. Malacol. Soc. London, VIII, 2, p. 118. G. B. 
SowERBY, 1916, Proc. Malacol. Soc. London, XII, 2-3, p. 67. 
Meladomus magnus Furtado. Koxsertr, 1911, in Martini and Chemnitz, ‘Syst. 
Conch. Cab., n. F., I, Ampullariide,’ p. 14, Pl. xxv, fig. 1. 
_ Luapula River (type locality; Capello and Ivens and R. L. Harger Coll.). 
Harger noted that these mollusks constitute the main food of Anastomus lamelligerus 
Temminck, the opeu-bill stork. 
This appears to be but a giant form of Lanistes procerus. 
Lanistes (Meladomus) ellipticus E. v. Martens 
Plate XVII, Figure 8 
Lanistes (Meladomus) ellipticus E. v. MartEns, 1866, in Pfeiffer, ‘Novit. Conchol.,’ 
II, p. 224, Pl. uxx, figs. 9 and 10 (type locality: Tete, on the Zambezi River, Portu- 
guese Hast Africa); 1897, ‘Deutsch Ost Afr., IV, Beschalte Weichth.,’ p. 168. 
GerRMatN, 1905, Bull. Mus. Hist. Nat. Paris, p. 256; 1908, ‘Rés. Scientif. Voy. 
Afrique Foa,’ p. 670. . 
Lake Tanganyika (Foa Coll.). 
Near Elisabethville in the Kimilolo River, a small affluent of the 
Kisanga, itself a tributary of the Kafubo (Luapula drainage); abundant 
in clear water of the river and of its sources, at a depth of about 0.75 
m. and less, on the fine gravel of the bed; 20 specimens (Michael Be- 
quaert Coll.; July 3, 1920). 
This species appears to be quite distinct from the L. ovwn group by 
the inflation of the upper part of the last whorl, the narrow, somewhat 
straightened columella and the microscopic sculpture of very fine, nearly 
regular striz in the direction of growth lines. The umbilicus is narrow. 
