SMITH : 310LLUSCA OF LAKE TAjSTGANYIKA. 



97 



Grandidieriana, Hami/ana, viiniita ( Bourguignat, ii, iii), and S. Foai 

 (Mabille, Bull. Soc. Pliilom. Paris, 1901, vol. iii, p. 56). 



Dr. Tauscli has considered this genus synonymous with Fascinella 

 of the Upper Chalk at'Ajka, Hungary, but I do not feel absolutely 

 certain that such is the case. The figure he gives of that genus, 

 copied from Sandbcrger, appears to show a different kind of columellar 

 fold, and no mention is made of palatal liroe, which appear to be 

 a feature in Syniolopsis. 



Syrnolopsis lacustris, Smith. 



Syrnolopsis lacustris, Smith : iii, p. 426 ; ii, p. 288, pi. xxxiii, figs. 



21-21i; Crosse, p. 119, pi. iv, fig. 6; Bourguignat, ii, pi. x, 



figs. 14-17; iii, p. 142; Pelseneer, p. 107; Martens, p. 210, 



pi. vi, fig. 46. 

 Fascinella lacustris, Tausch : Sitzungsb. Akad. Wiss. Wien., 1884, 



vol. xc, p. 68, pi. i, fig. 11. 



SxRNOLOPSis carinifera, Smith. Pig. 6. 



Syniolopsis carinifera, Smith: iir, 1889, vol. iv, p. 174. 



Anceya. 



Anceya, Bourguignat: i, p. 14; Moll. Afrique Equator., 1889, p. 118; 

 M artens, p. 211. 

 This genus appears to differ from Syniolopsis only in being 

 longitudinally costate. 



Ancey'a Giraudi, Bourguignat. 



Anceya Giraudi, Bourguignat: i, p. 15 ; Moll. Afrique Equator., 1889, 



p. 118, pi. vii, figs. 12, 13. 

 Syrnolopsis {Anceya) Giraudi, var., Smith : iii, 1890, vol. vi, p. 94. 



Anceya admieabilis, Bourguignat. 



Anceya admirahilis, Bourguignat : Moll. Afrique Equator., 1889, 

 p. 119, pi. vii, figs. 10, 11. 



BURTONILLA, n.gcu. Pig. 2. 

 Turhonilla (?) terehriformis. Smith : iii, vol. vi, p. 95 ; Martens, p. 212. 

 When describing this species I deemed it advisable to place it 

 provisionally in a known genus. Since then our knowledge of the 

 Tanganyikan fauna has been greatly increased, and we now find that 

 none of the forms with a thalassoid facies fall into any of the known 

 marine genera. Such being the case, it seems to me advisable to 

 create a new genus for the reception of this curious and interesting 

 shell. It may be thus characterized : — Shell elongate, slender, 

 imperforate; whorls numerous, longitudinally costate, glossy, apparently 

 without a periostracum ; aperture entire, not channelled in front ; 

 columella reflexed anteriorly, above obsoletely uniplicate ; labrum 

 probably thin. 



