1927] | Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 275 
M. fenaria Renve, 1860, ‘Conchol. Iconica,’ XII, Melania, Pl. xrx, fig. 134. Fernan- 
do Po (type locality), Gold Coast, Liberia, Calabar, Camerocn, Gaboon. 
Potadoma freethii guineensis (Reeve) = Melania guineensis REEVE, 1860, ‘Conchol. 
Iconica,’ XII, Melania, Pl. xx, fig. 142. Coast of Guinea. This appears to be at 
least sabuep eae: distinct from freethii by the much finer sculpture (See E. A. 
Smith, 1887, Proc. Zool. Soc. London, p. 566). 
Potadoma funerea (Preston) = Melania funerea Preston, ie Proc. Malacol. 
Soc. London, VIII, 1, p. 7, fig. (on p. 8). Gold Coast. 
Potadoma graptoconus Pilsbry and Bequaert. See p. 276. 
Potadoma ignobilis (J. Thiele). See p. 278. 
Potadoma liberiensis (Schepman) = Melania ‘liberiensis Scumpman, 1888, Notes 
Leyden Mus., X, p. 248, Pl. x, figs. 3a-b and 4a-b. St. Paul’s River, near Bavia, 
Liberia. 
Potadoma liricincta (EK. A. Smith). See p. 280. 
Potadoma liricincta dryas Pilsbry and Bequaert. See p. 282. 
Potadoma liricincta latior (J. Thiele). . Sze p. 282. 
Potadoma liricincta major (J. Thiele). See p. 281. 
Potadoma liricincta semperlirata Pilsbry and Bequaert. See p. 282. 
Potadoma liricincta walikalensis Pilsbry and Bequaert. See p. 281. 
Potadoma medjeorum Pilsbry and Bequaert. See p. 288. 
Potadoma mérchit (Reeve) = Melania mérchii ReEve, 1859, ‘Conchol. Iconica,’ 
XII, Melania, Pl. xv, fig. 108. Habitat not given originally. Brot in 1874 states that 
it came from ‘‘ Guinea danica,’’ which is what is now called the Gold Coast.? 
Potadoma mungwana Pilsbry and Bequaert. See p. 287. 
Potadoma pokoensis Pilsbry and Bequaert. See p. 279. 
Potadoma ponthiervillensis (Dupuis and Putzeys). See p. 284. 
Potadoma ponthiervillensis mut. spoliata (Dupuis and Putzeys). See p. 285. 
Potadoma sancti-pauli (Schepman) = Melania sancti-pauli ScHEpMAN, 1888, 
Notes Leyden Mus., X, p. 248, Pl. x, figs. 2a-c. St. Paul’s River, near Bavia, Liberia. 
Potadoma schoutedenit Pilsbry and Bequaert. See p. 277. 
Potadoma superba Pilsbry and Bequaert. See p. 286. 
Potadoma superba mut. inculta Pilsbry and Bequaert. See p. 287. 
Potadoma tornata (EK. v. Martens). See p. 288. 
Key to the Species of Potadoma of the Belgian Congo 
1. Shell appearing smooth to the eye, or having a few spiral cords around the 
columella; periphery raunded or angular si be oo wae wine 2. 
‘Shell having distinct spiral sculpture in the peripheral region or throughout. .7. 
2. Minute sculpture of distinct, very close spiral striz; 3 or 4 low cords around the 
columellas: periohery rounded oi.) See as ab Sipps Bie ea ea ela 2 3. 
Not so sculptured: no cords around the columeule oo ome ie eg abn 4, 
3. Spire rather long; aperture less than half the total length; young shells without 
periphetal cordet. cei ee, P. graptoconus Pilsbry and Bequaert. 
Spire quite short; aperture more than half the total length; young shells with 
cords at and below periphery........ P. schoutedeni Pilsbry and Bequaert. 
1E. v. Martens (1886, Sitz. Ber. Ges. Naturf. Fr. Berlin, p. 114) mentions, without description, a 
Melania nigritina var. gracilior, from Abetifi, Gold Coast. 
The Hei occupied for some time four trading atatinns at Christiansborg, Ningo, Temma, and 
Kitta (Quitta). 
