1927] Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 259° 
characterized by having the ribs, in the adult stage, deeply cut into tubercles by four 
spiral furrows (on the last three whorls), the upper furrow a little more emphatic; 
on the base there are 3 or 4 spiral cords. 
Length, 8.5 mm.; diameter, 3.5 mm.; about 346 whorls remaining. 
The type in the Congo Museum, Tervueren, is the Specimen illus- 
trated in Dautzenberg and Germain’s Plate 11, fig. 5, and in our Pl. 
XXI, fig. 13, from the Lualaba River at Bukama. 
Melanoides kinshassaensis (Dupuis and Putzeys) 
Text Figure 42 
Melania kinshassaensis Dupuis anp Putzrys, 1900, 
_ Ann. Soc. Malacol. Belgique, XXXV, Bull. Séances, p. xix, 
figs. 33 and 34. 
Type locality: Kinshasa. Fig. 42. Melanoides 
Leopoldville, one immature example (J. kinshassaensis (Du- 
Bequaert Coll.). ; puis and Putzeys). 
Copy of orginal fig- 
ures. 
We copy the original figures of this species. 
Melanoides liebrechtsi (Dautzenberg) 
Plate XXI, Figures 14-18 
Melania liebrechtsi DauTzENBERG, 1901, Ann. Soc. Malacol. Belgique, XXXVI, 
Mémoires, p. 4, Pl..1, figs. 5-8. G. C. Spencer, 1928, Journ. of Conchology, XVII, 
Bae As 
7 Type locality: Upper Congo, without more definite indications (Collector un- 
known). Also found at Ngandu (F. M. Dyke Coll.) on the right bank of the Congo 
River. 
Leopoldville, abundant on sand banks in the Congo River (H. 
Lang and J. Bequaert Coll.). 
Many of the examples of this beautiful snail are wider than those 
figured by Dautzenberg. They measure: 
Length,. 26.5 mm.; diameter, 11.0 mm.; 434 whorls remaining. 
fe eee = TOS aay ae Ny 
Pl. XX], fig. 17 represents a young individual, 18 mm. long. The length of the 
other specimens figured is respectively 26.4, 24.0, 24.0, and 17.7 mm. 
Melanoides langi, new species 
Plate XXII, Figures 1 and 2 
Sand banks of the Tshopo River (type locality), near Stanleyville, 
March, 1915; abundant (H. Lang Coll.). Malela, abundant, and | 
Barumbu, one specimen (J. Bequaert Coll.). 
The shell is rather slender, turrited, thin, deep olive-buff, the early whorls lost. 
The upper whorls retained are convex with several spiral threads. The last two to 
