SMITH : MOLLUSCA OF LAKE TANGANYIKA. 99 



Planoebis Monceti, Bourguignat. 



Planorhis Monceti, Bourguignat: iii, p. 18. 



. IsiDORA CouLBOisi (Bourguignat). 



Physa Coulhoui, Bourguignat: ii, pi. i, figs. 24-5 ; iii, p. 14. 

 Isidora Coulboisi, Martens : p. 139. 



IsiDORA Randabeli (Bourguignat). 



Pht/sa Rnndaleli, Bourguignat : ii. pi. i, figs. 26-7 ; iii, p. 12. 

 Isidora Randaheli, Martens: p. 140. 



Physopsis Tanganyic^, Martens. 

 Physopsis Tanganyicce, Martens, p. 144, pi. vi, fig. 12. 



Neothauma. 



Neothauma, Smith: i, p. 349; Crosse, p. Ill; Grandidier, Bull. Soc. 

 mal. France, vol. ii, p. 162; Bourguignat, i, p. 25; ii, p. 9, 

 pis. ii, iii ; iii, p. 24 ; Martens, p. 202 ; Moore, Proc. Zool. 

 Soc, 1901, vol. ii, p. 466, pis. xxv, xxvi ; ii, p. 264, fig. 46. 

 Of this genus I can admit only a single species, although M. Bour- 

 guignat has split it up into eight. It certainly exhibits very great 

 variation, hut I think all the connecting links are observable even in 

 the set of illustrations given in M. Bourguignat's work. There 

 certainly is much less varitition shown in this species than in the 

 common whelk, Buccinum undatum. 



Neothauma Tanganyicense, Smith. 



Neoihauma Tang any i cense, Smith : i, p. 349, pi. xxxi, figs. 1-lc ; ii, 



p. 293, operculum; iii, 1889, vol. iv, p. 173; Crosse, p. 112; 



Martens, p. 203 ; Moore, ii, pp. 264-5, figs. 44-46 ; Proc. 



Zool. Soc, 1901, vol. ii, p. 466, pis. xxv, xxvi. 

 Neoihauma 2'anganihanimi, Grandidier: Bull. Soc. mal. France, 1885, 



vol. ii, p. 163 ; Bourguignat, i, p. 26 ; ii, pi. ii, fig. 1 ; iii, p. 26. 



Pelseneer considered this species a Paludina. The other names 



applied to it are : bwarmatum, euryomphalus, Giraudi, Jouherti, Vysseri, 



all of Bourguignat, and Prtdoicziana and Servainiana of Grandidier. 



(See Bourguignat, ii, iii.) 



YiviPAEA Beincatiana, Bourguignat. 



Vivipara Brincatiana, Bourguignat: ii, pi. iv, fig. 1; iii, p. 41; 

 Martens, p. 183. 

 V. Bridouxiana, Bourguignat (ii, iii), does not seem to be separable 

 from the present species, which may eventually prove to belong to the 

 genus Cleopatra. 



Cleopatea Guillemeti, Bourguignat. 



Cleopatra Guillemeti, Bourguignat: ii, pi. iv, fig. 4; iii, p. 46; 

 Martens, p. 186, 



