CRANDIDIERIA 1053 



whitish, not shining ; pseudocardinals somewhat split up ; an- 

 terior scars impressed ; nacre silvery white to purple. 



Length 26, height 18, diam. 14 mm. -> 



Lake Taganyika. 

 Unio hurtoni Woodward, Proc. Zool. Soc. Lond., 1859, p. 349, 



pi, XLVii, fig. 2. — SowERBY, Conch. Icon., XVI, 1866, pi. 



XLVii, fig. 251. — Smith, Proc. Zool. Soc. Lond., 1881, p. 



297, pi. XXXIV, figs. 33, 33&. 

 Margaron fUnio) burtoni Lka^ Syn., 1870, p. 31. 

 Grandidieria hurtoni Bourguicnat, Bull. Soc. Mai. Fr., II, 



1885, p. 6. — SiMP.soN, Syn., 1900, p. 828. 

 Grandidieria cyrenopsis Bourguignat, Bull. Soc. Mai. Fr., II, 



1885, p. 9, pi. I, figs. 7-9; Icon. Mai. Tan., 1888, pi. xix, figs. 



1-3- 



Woodward's figure, which agrees well with shells in the 

 National Museum collection, shows this a short shell, a little 

 full in the post-basal region and very bluntly pointed. The 

 epidermis is som.etimes almost silky. The sculpture is some- 

 times quite faint. According to Smith the nacre varies from 

 white to copper\'-purple. 



Var. serz'ainiana Bourguignat. 



More circular in outline than the type, almost as high as 

 long, with stronger sculpture. 



Lake Tanganyika. 

 Grandidieria servainiana BourguigNzVT, Bull. Soc. Mai. Fr., 



II, 1885, P- 6. 

 Unio burtoni var. servainiana von Martens, Besch. Deuts. 



Ost-Af., 1897, p. 238. 

 Grandidieria burtoni var. servainiana Simpson, Syn., 1900, p. 



828. 



Var. insignis Bourguignat. 



x\lmost equilateral, triangular, reminding one of the form 

 of SpisiUa solidissima ; lower edge moderately rounded. 



Lake Tanganyika. 

 Grandidieria insignis Bourguignat, Esp. Ouk. Tan., 1885, p. 



16. 



