220 Bulletin American Museum of Natural History [Vol. LIII 
Schubotz, Gromier, and Bequaert, either alive in the lake or subfossil on its southern 
shores, have proved to be B. albertv. 
Dautzenberg and Germain (1914, Rev. Zool. Afric., IV, 1, p. 61) have recorded B. 
humerosus from the Katanga District of the Belgian Congo: in the Lovoi River near 
Kikondja; in Lake Kisale; and in the Luvua River (all Bequaert Coll.). A specimen 
of the Lake Kisale lot which we have examined, is quite distinct from B. humerosus 
of Lake Victoria and we have described it as B. (Gabbia) kisalensis. We therefore 
doubt that true B. humerosus occurs in the Katanga. 
This species agrees with B. albert: in all characters except the form 
of the last whorl, which has a decidedly more conspicuous shoulder 
bounded by a rounded angulation. The operculum is similar. 
‘Length, 4.5 mm.; diameter, 4.2 mm. 
The example figured is from a lot collected by Sir Charles Eliot at 
Kisumu, on the eastern shore of Lake Victoria, a place near the original 
locality. It seems likely that B. alberti will eventually be ranked as a 
subspecies of humerosus. 
fo t 
He eA 
ae eee mr 
: vA 
ats HERE Naudia 
= 
Fig. 20. Mysorella (?) multisulcata (Bourguignat). Tanganyika. 
MysoreELta Godwin-Austen 
Mysoria Gopwin-AusteEn, 1919, Rec. Indian Mus., XVI, 3, p. 211. Monotype: 
Bithynia costigera Kkiister var. curta Nevill. Not Mysoria Watson, 1893. 
Mysorella GopwIn-AusTEN, 1919, Rec. Indian Mus., XVI, 6, p. 431. New 
name for Mysoria Godwin-Austen, preoccupied. 
The shell is umbilicate, spirally lirate with the peristome slightly expanded, thick- 
ened. Operculum calcareous, concentric, with a small spiral center. 
Teeth of the radula asin Bulimus except that the central has only a single, short 
basal denticle on the thickening which borders the lateral margins on each side. 
The single African species referred to this genus resembles the Indian 
M. costigera (Kiister) in sculpture of the conspicuously umbilicate shell, 
but as it has no thickening or expansion of the peristome, and its oper- 
culum and radula are still unknown, the generic reference appears 
highly dubious. Mysorella is thus introduced into the African fauna 
simply for the reason that our species cannot be referred to any known 
African genus. 
