No. 2. — Some West African Amphibians. 



By Thomas Barbour. 



Thanks to the kindness of Dr. A. G. Ruthven, the Curator of the 

 Museum of the University of Michigan, I have been able to study a 

 series of amphibians collected in the Cameroons by the Rev. George 

 Schwab, who has also recently sent a fine collection direct to this 

 Museum. In connection with this material I have worked over some 

 specimens in the Museum of Comparative Zoology from other sources. 

 Since the wonderful amphibian fauna of this region is represented in 

 American museums by so little recently collected material, this list 

 with notes and figures of some of the less known forms will be of 

 interest. 



By the generosity of Dr. Ruthven the Museum of Comparative 

 Zoology retains the types and a series of duplicates of the species 

 represented in their collection. 



Our knowledge of the amphibian fauna of Cameroons has been 

 brought to date most completely, with critical notes and keys for the 

 identification of the genera and species by Fritz Nieden (Mitteil. 

 Zool. Museum, Berlin, 1908, 3, p. 489-518). 



All of the Schwab collection was made at Efulen, Kribi, Cameroons, 

 during 1907-10. 



The Barbour collection mentioned in these pages was obtained 

 from various sources, and is now a part of the collection of the Mu- 

 seum of Comparative Zoology. 



Rana crassipes Buchholz. & Peters. 



Four specimens from Efulen, Kribi, Cameroons, Schwab collection. 



One of the specimens shows an interesting malformation of the 

 hind foot. Three toes are missing, the second and fourth only being 

 present. The web is almost normal in extent and shape, but thickened 

 and folded back from the inner margin, where it has partially fused 

 on itself. The inner edge formed by the fold is somewhat cornified, 

 and the foot is apparently almost as useful as the normal one. 



