128 Mr. E. A. Smith on the Marine 



24. Unio Lourdeli^ Bourguignat. 

 (PI. XII. figs. 13-15.) 



Unio Lourdeli, Bourguignat, Bull. Soc. Mai. France, 1887, vol. iv. 

 p. 271. 



This is an elongate posteriorly rostrate form and quite 

 distinct from the rest of the species from the lake. The 

 shells figured are in the collection of S. I. Da Costa, Esq. 



2.5. Mutela rubens, Lamarck. 



Mutela rubens, Smith, Ann. & Mag. Nat. Hist., Aug. 1890, p. 149. 



There is a single valve from the lake obtained by Emin 

 Pasha and presented by him to the British Museum. 



26. Mutela suhdiaj>kana, Bourguignat. 



Mutela subdiaphana, Bourguignat, Moll. fluv. Ouker6w6, 1883, p. 5 ; 

 Bull. Soc. Mai. France, 1887, vol. iv. p. 268. 



Apparently no description of this species has as yet 

 appeared. 



27. Mutela Bourgmgnati, Ancey. 

 (PI. XII. fig. 16.) 



Mutela Bowffuiffnati, Bourguignat, Especes nouv. et gen. nouv. Ouk6- 

 r6w6 et Tanganika, 1885, p. 8. 



Hab. Shores of the lake, near the mouth of the Chimayou 

 [Bourg.) ; also Emin Pasha in Brit. Mus. 



28. Spatha {Spathella) Bourguignati, Ancey. 

 Spatha {Spathella) Bourguignati, Bourguignat, /. c. 1885, p. 12. 



Hab. South shore of the lake [Bourguignat and Emin 

 Pasha) . 



EXPLANATION OF PLATE XII. (part). 



Fig. 3. Viviparus rubicundus. 



Fig. 4, Viviparus cepoides. 



Fig. 5. Cleopatra Gui/lemei. 



Fig. 6. Viviparus jucundus. 



Fig. 8. Viviparus victorice (var. b). 



Fig. 9. Viviparus victo7'i(S (typical). 



Fig. 10. Viviparus victorice (var. a). 



Fig. 11. Unio Bakeri. 



Fig. 12. Unio acwninatus. 



Figs. 13-15. Uriio Lourdeli. 



Fig. 16. Mutela Bourguignati. 



