1927] Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 249 
externo-basal nucleus. Oriental ane Kthiopian Regions. African genus: 
Cleopatra. 
The reference of Cleopatra to ile Paludomine: (Paludomus, Tanalia, 
Philopotamis and Stomatodon) is provisional; perhaps it should form 
another subfamily, Cleopatrine. In describing the animal Smith did not 
mention mantle processes, such as are said to exist in Philopotamis. 
The shell is usually perforate, unlike other melanians. 
The following thalassoid genera of Lake Tanganyika appear from 
their anatomical structure to be Melaniide or closely related to that 
group: Limnotrochus E. A. Smith, Chytra J. E. 8. Moore, Bythoceras 
J. EK. 8. Moore, Paramelania EH. A. Smith, Jouberita Bourguignat, 
Randabelia Bourguignat, Edgaria Bourguignat, Lechaptoisia Ancey, 
Spekia Bourguignat, Tanganyicia Crosse, Stanleya Bourguignat, Girau- 
dia Bourguignat, and Reymondia Bourguignat. Lavigeria Bourguignat 
(N assopsts) is thought by J. E. 8. Moore to represent a distinct family 
which he identifies with the Purpurinidz. In part of this view he is 
followed by Thiele,! who segregates Lavigeria in a family Lavigeride, 
grouped with the Cyclophoride, Viviparide and Ampullariide. The 
other Tanganyikan genera form his subfamily Paramelaniine of the 
Tiaride (Melaniide). | 
Melania tanganyicensis EK. A. Smitru, 1880, Ann. Mag. Nat. Hist., 
(5) VI, p. 427, from Lake Tanganyika, is unknown to us. It is the type 
of the genus Horea Bourguignat (1888, ‘Iconogr. Malacol. Tanganika,’ 
p. [27], Pl. v1, figs. 28-29) which antedates Horea E. A. Smith, 1889. 
Madagascar possesses a number of additional genera of Melaniidee 
which apparently have no close relatives on the African continent. 
The African origin of the following species is extremely doubtful and 
consequently they have not been considered in the course of our studies: 
Melania decollata Reeve, 1859, ‘Conchol. Iconica,’ XII, Melania, Pl. x11 
fig. 78. ‘Guinea.’ Thisis, of course, very different from the East African Cerithidea 
decollata (Bruguiére). 
Melania ferrea REEVE, 1859, ‘Conchol. Iconica,’ XII, Melania, Pl. 111, fig. 9. 
“Borneo; Grand Bassam, W. Africa.’’ Brot in 1874 synonymizes this with M. cor- 
porosa Gould, of Tahiti. 
Melania maurula Reeve, 1859, ‘Conchol. Iconica,’ XII, Melania, Pl. 1v, fig. 15. 
‘Southeast coast of Guinea.”’ | 
Melania pallidula Reeve, 1860, ‘Conchol. Iconica,’ XII, Melania, Pl. xx1, fig. 
153... ““West Africa.’ The name is corrected into M. pallens in the Errata on the last 
page of the Index to the Melania part of Reeve’s work. 
Melania phlebotomum RzrEveE, 1859, ‘Conchol. Iconica,’ XII, Melania, Pl. xv, 
fig. 105. ‘‘West Africa.’’ Brot in 1874 synonymizes this with M. De eaaceliala aero 
Busch, of Java. 
11925, Handbuch der Zoologie, V, erste Lieferung, pp. 79, 83. 
