720 UNIO 
parallel: hinge and muscular impressions unknown. Epider- 
mis of a clear yellowish-chestnut, almost gray towards the 
beaks and dark brown posteriorly ; strize not strong, very irreg- 
ular. 
Length 11.5, height 4.75, diam. 3.5 mm.” (Germain). 
Type locality, Madagascar. 
Unio malgachensis GERMAIN, Bull. Mus. Hist. Nat., 19g1t, p. 
138; pla, figs. 3) 4555: 
“The unique example collected by M. Geay is a young shell 
found alive. The necessity of keeping it intact for the collec- 
tion of the Museum d’histoire naturelle has prevented me from 
studying the hinge and muscular impressions. Consequently 
it is impossible for me to decide definitely as to what subgenus 
the species should be referred. I have thought it necessary 
to describe and figure this Unio, which will certainly be found 
again some time and which shows that the island of Madagas- 
car has a more varied fauna of fresh-water pelecypods than 
has heretofore been believed.” 
UNIo STOLATUS von Martens. 
“Shell elongate, compressed, concentrically striate; epider- 
mis brown, opaque; anterior extremity shortly rounded-trun- 
cate; posterior elongate, rostrate; wing slightly elevated; an 
obtuse ridge extends backwards and downwards from the 
beaks, behind which the posterior slope is sculptured with 
small, oblique, decurrent folds; upper posterior margin very 
oblique, lower posterior margin somewhat rounded; ventral 
margin. moderately curved in front, straight in the middle, 
slightly ascending posteriorly ; cardinal teeth thin, compressed, 
parallel with the dorsal margin, obliquely sulcate above; nacre 
bluish, pale yellowish towards the umbones. Beaks at one- 
fourth of the length. 
Long. 72, alt. vert. 32, alz 39, diam. 17.5 mm.” (von Mar- 
tens). 
Type locality, Lake Danau Baru, Sumatra. 
Unio stolatus VON Martens, Nachtr. Deutsch. Mal. Ges., 1goo, 
pis. 
“Only a single example, rather thin-shelled, beaks only 
slightly eroded.” 
