18 REPTILES. 



18. Rana bibronii. 

 IlaUowell, Proc. Ac. Nat. Sc. Philad. 1845, p. 249. 



Head longer than broad ; miizzle rather elongate and pointed ; 

 tympannm two-thirds the width of eye ; skin of the back "svith nar- 

 row longitudinal fokls. Legs and toes slender, half- webbed ; fom-th 

 toe one-tliird longer than fifth ; metatarsus with one tubercle. Vo- 

 merine teeth small, in two rather obHque scries, beginning from near 

 the front edge of the inner nostrils. 



A whitish longitudinal band from the snout to anus ; above with 

 dark spots ; .sides of head brown ; a white band from just below the 

 eye to the shoulder ; beneath unifonn whitish. 



rt. Half-grown. Gaboon. From Mr. Cuming's Collection. 

 19. Rana grayi. 



Smith, Blmtr. of the Zool. of S. Afr. pi. 78. f. 2. 



Head nearly as long as broad, with moderate, rounded muzzle ; 

 tympanum circular, half the width of eye ; skin of the back and 

 sides with broad longituchnal folds, and flat tubercles between. Toes 

 rather elongate, webbed only at the base ; fourth toe one-third longer 

 than fifth ; metatarsus wdth one, rather prominent tubercle. Vomer- 

 ine teeth in two, rather obhque series, situated near the front edge 

 of the inner nostrils. 



Bro%mish yellow, brown variegated with large brown spots above ; 

 temple brown ; beneath straw -yellow. 



a-c. Adult and half- grown : discoloured. South Africa. 

 20. Rana mascareniensis. 



Diim. Sr Bihr. p. 350 ; Bell, Zool. of the Beagle, liept. p. 32. pi. IG. f 2. 



Body with six or eight longitudinal folds ; toes and fingers slender, 

 with bliuit tip and moderate subarticular tubercles ; toes not webbed 

 to the end, fourth one-thii'd longer than fifth and thii'd ; metatarsus 

 with one tubercle. Vomerine teeth in two obhque series. Tympanum 

 distinct, of moderate size. Greyish or bro-mi above, sometimes black- 

 spotted, Avith or without paler vertebral band. On each side of the 

 tongue a sHt for the vocal sac. 



a. Adult : bad state. Isle de France. Presented by Charles Darwin, 

 Esq. 



21. Rana fuscigula. 



Duni. ($■ Bihr. p. 386 ; Sinith, M. of S. Aft: App. p. 22. 



Head as long as broad ; muzzle rather short, rounded ; tympanum 

 distinct, moderate ; skin of back A^dth irregular longituchnal plaits ; 

 toes of moderate length, webbed to the tip, but deeply notched ; foiu-th 



