192 | Bulletin American Museum of Natural History [Vol. LIII 
The apex is perfectly preserved, owing to the thick coat of iron 
hydroxide. 
L. neavei Melvill and Standen, from Kapopo, northern Rhodesia, 
appears to be close to this form. The locality is not far away, but in the 
Zambezi drainage. It differs by the wider umbilicus as shown in the 
figures, and nothing is said of angulation of the upper whorls. 
Lanistes intortus (Lamarck) 
Plate XVIII, Figures 2, 3, 4 
Ampullaria intorta Lamarck, 1822, ‘Hist. Nat. Anim. sans Vertébres,’ VI, 2, 
p. 179 (without locality); figured without name in 1816, ‘Encyclop. Méthod., 
Vers,’ Pl. coccuvi, figs. 4a-b. Bory pg St. Vincent, 1827, ‘Encyclop. Méthod., 
Vers,’ Explanation of Plates, p. 177. O. Barrarr, 1885, 24. u. 25. Bericht. 
Offenbacher Ver. f. Naturk., p. 193. 
Lanistes intortus Lamarck. E. v. Martens, 1870, in Pfeiffer, ‘Novit. Conchol.,’ 
V, p. 191, Pl. civ, figs. 1-3; 1882, Jahrb. Deutsch. Malakoz. Ges., IX, p. 248. 
Dupuis AND Purzgys, 1901, Ann. Soc. Malacol. Belgique, XXXVI, Bull. Séances, 
p.lx. C.R. Barrer, 1913, op. cit., XLVII, (1912), p. 102. 
Meladomus intortus Lamarck. Koper, 1912, in Martini and Chemnitz, ‘Syst. 
Conch. Cab., n. F., I, Ampullariide,’ p. 27, Pl. xxrx, figs. 4-6. 
Meladomus intortus var. hesset Kopeut, 1912, in Martini and Chemnitz, ‘Syst. 
Conch. Cab., n. F., I, Ampullariide,’ p. 48, Pl. xxxa, figs. 6-8. : 
Near Banana (German Expedition of the ‘‘Gazelle’? and P. Hesse Coll.); in 
brackish water at San Antonio (P. Hesse Coll.). Zambi (Dupuis Coll.). Boma (Pohl 
Coll.). Dupuis and Putzeys also refer to this species, two specimens from Stanley 
Falls (Dupuis Coll.). We have not recognized intortus among the numerous specimens 
of Lanistes we have seen from that locality. Also recorded from the coast of Loango. 
Zambi (Lang and Chapin and J. Bequaert Coll.). Malela (J. Be- 
quaert Coll.).. Banana (Lang and Chapin Coll.). 
The history of this species has been discussed by von Martens, 
Kobelt, and ©. R. Beettger. The origin of Lamarck’s specimen was not 
known, and his figure shows a narrower aperture than specimens from the 
Congo mouth treated of by the authors mentioned; yet this may have 
been due to faulty drawing, and, on the whole, we agree with von 
Martens and Beettger that A. intorta of Lamarck applies to the form 
under consideration. | 
The shell is turbinate with small umbilicus, which rapidly widens 
at the opening, funnel-like, and is bounded by an angle varying from 
distinct to weak. There is a very inconspicuous shoulder angle on the 
upper whorls when these are well preserved. Later whorls remain 
flattened below the suture, but are not in the least angular. The last 
whorl is strongly convex. The glossy surface is lightly marked with 
growth-lines, but no spiral sculpture. The color is chamois with chest- 
