302 Bulletin American Museum of Natural History [Vol. LIII 
8. Sculpture of close, even, spiral cords and weak axial ripples. Small (less than 
8 mm. long), ovate-conic, with thick, simply concave columella. 
Lechaptoisia Ancey. 
Sculpture of spiral cords or threads and axial folds or ribs. Generally over 10: 
‘init. lone.) ohmmena mmioles eA Pe es Sas 9. 
9, Peristome thickened or produced outside at both ends of the aperture... .10. 
Peristome not thickened outwardly atthe ends: (0s. ye hee we es ewes ‘G8 
10. Peristome thickened outside but not produced at the ends of the aperture. 
Paramelania E. A. Smith. 
Peristome produced into a horn at the upper or at both ends. 
Paramelania subgenus Bythoceras J. E. 8. Moore. 
11. Columella having at its base a low, rounded prominence, or tapering to a point. 
Joubertia Bourguignat. 
Lavigeria Bourguignat. 
Randabelia Bourguignat. 
Columella simply concave........... Hirthia Ancey and Edgaria Bourguignat. 
As the Congo Expedition did not visit the region of Tanganyika, we 
merely list the species to complete our Belgian Congo and African cata- 
logue. The industry of Bourguignat, who did not distinguish between 
individual mutations and racial forms, has so overloaded the list of 
species that no proper revision can be made without access to his collec- 
tion. In the treatment of species we mainly follow E. A. Smith." 
Fig. 58. Teeth of Tanganyicia rufofilosa (EK. A. Smith) 
Tanganyicia GROUP 
Solid, imperforate or rimate, smooth or spirally engraved shells, oval, with very 
short or conic spire. Operculum concentric around a paucispiral center, or wholly 
paucispiral. Radula (Fig. 58) with long side teeth. Viviparous; a brood pouch on 
the left of the head (in Tanganyicia and Giraudia). 
Nothing is known of the anatomy or operculum of Stanleya, Coul- 
boisia, Batzea, or Bridouxia. 
Tanganyicia lives on stones in shallow water. 
11904, Proc. Malacol. Soe. London, VI, 2, pp. 77-104. 
