I054 GRANDIDIKRIA 



Unio hiirtoni var. insignis von Martens^ Besch. Deuts. Ost- 



Af., 1897, p. 238. 

 Grandidieria burtoni var. insignis Simpson. Syn., 1900, p. 828. 



Var. stnranyi (von Martens). 



Shell more depressed and more convex than the typical 

 form : nacre yellowish-gray or reddish-gray, iridescent. 



J^ake Tanganyika. 

 Grandidieria Sturany, Baumann, Durch Massailand, 1894, p. 



6, ]d1. XXIV, fig. 31 ; XXV, fig. 35. 

 Unio burtoni var. sturanyi von Martens, Besch. Deuts. Ost- 



Af., 1897, p. 238. 

 Grandidieria burtoni var. stnranyi Simpson, Syn., 1900, p. 828. 



The above forms have, with one exception, never been fig- 

 ured, but are placed by von Martens under burtoni as varieties. 

 I know nothing about them but give them on his excellent 

 authority. 



Grandidieria tancanyicensis (Smith). 



Shell small, irregularly oval, solid, somewhat inflated and 

 inequilateral ; beaks full and high, turned inward and forward, 

 sculptured with fine, zigzag-radial corrugations ; lunule indis- 

 tinct ; anterior end narrowed and rounded ; base line well 

 curved, a little fuller just behind the middle; posterior ridge 

 close to the dorsal line, narrowly rounded, the whole curved 

 slightly to a point behind on the median line; surface finely 

 and unevenly concentrically sculptured and often having traces 

 of radial sculpture ; it is also more or less overlaid with deli- 

 cate granules arranged as if engine-chased; pseudocardinals 

 rather soHd, ragged; nacre whitish, liver-colored or purplish, 

 sometimes coppery, often lighter on the border ; epidermis 

 greenish or ashy-brown, often densely rayed. 



Length 24, height 18, diam. 12 mm. 



Lake Tanganyika. 

 Unio tanganyicensis Smith, Proc. Zool. Soc. Lond., 1880, p. 



351, pi. XXXI, figs. 9, 9a ; 1881, p. 298, pi. XXXIV, fig. 35. 

 Grandidieria tanganyiccnsis Simpson, Syn., 1900, p. 828. 

 Grandidieria tanganikana BourguiGnat, Bull. Soc. Mai. Fr.,. 



IT, 1885. p. 7. 



