Dr. A. Giinther on some East- African AnteIoj)es. 425 



external folds of tlie skin along the lower side of the throat 

 show also clearly that the oesopliagus is very distensible, and 

 that this turtle feeds on larger animals (fish or frogs) than 

 one might suppose from the slenderuess of the neck. 



The legs are covered with soft scutes, of which the majority 

 are very small, only a few being enlarged and transverse along 

 the inner and outer edges of the fore and hind limbs. Toes 

 broadly webbed, and the forearm provided with a fringe of 

 skin. Claws four in front and behind, sharp, and of moderate 

 size. 



Tail extremely short. 



Shell horn-coloured above, yellowish below; head, neck, 

 and legs of a sandy colour; a white band proceeds from the 

 angle of the mouth towards and along the lower side of the 

 neck ; it is edged wuth brown above and below, and seems to 

 cross the eye and the forehead. Throat mottled with brown. 



incli. lia. 



Length of carapace 3 



Greatest width of carapace 2 6 



Length of sternum 2 4 



Greatest width of sternum 1 7 



Length of head and neeis 1 11 



Length of head 11 



Width of head 7 



Length of eye 1 J 



The specimen was discovered by Lieut. Gairdner in fresli 

 water south of the Rio de la Plata. It is evidently very 

 young, the umbilical cicatrix being still visible. Like the 

 Matamata this species seems to be of sluggish habits, as fungoid 

 growth has made its appearance on the upper shell as well as 

 on the sternum ; also in other respects the habits of both are 

 probably identical. 



LIV. — Note on some East-African Antelopes supposed 

 to he new. By Dr. A. GiJNTHER, F.R.S. 



Col. the Hon. Wenman C. W. Coke kindly placed in my 

 hands some years ago the skull of a Hartebeest {Alcelaphus) 

 which he had killed on the east coast of Africa, on his way 

 to the Mpwapwa Mountains. The horns dilfered so remark- 

 ably from those of the other species of this genus, that I con- 

 sidered it then to be the type of a probably new species ; and 



