66 DR. J. E. GRAY ON PTERONURA SANDBACHII. [Jan. 23, 



the hinder or tubercular grinder moderate, with a nearly circular 

 crown. 



PtERONTJRA SANDBACHII. (PI. VII.) 



Fur bright bay brown above and below; hairs all nearly of a 

 uniform brown colour ; lips and a large irregular patch on the throat 

 and some spots on the side of the throat bright yellow. 



Pteronura sandbachii, Gray, Loudon's Mag. N. H. i. 580, 1837 ; 

 Ann. & Mag. N. H. ii. 285, t. 14, 1839. 



Pterura sandbachii, "Wiegniann's Arch. iv. 392, 1838 (published 



1839). 



Hah. Demerara {Mus. Boij. Institution, Liverpool). Young. 



Length of adult female (a tanned skin in the possession of Mr. 

 Bartlett), body and head 43, tail 24, = 67 inches. Throat with two 

 bright yellow streaks and some yellow spots. 



Var. kappleri. B.M. 



Bright golden brown above and below ; iiairs brown, with nume- 

 rous white hairs intermixed ; lips, chin, and an elongated streak on 

 each side of the throat, which is dilated behind, and one branch of 

 it extended up to the side of the chest, white. 



Young duller, greyer ; lips and throat spotted, white. 



Ltitra brasiliensis, Krauss, Mus. Stutgardt. 



Hab. Surinam {Kappler). 



The white hairs are better seen when the fur is examined by a 

 hand magnifier. 



Skull of adult : — Length 6, of brain-case from the back edge of 

 the orbit 4g, of the zygoma and orbit 3| inches ; width at the zygo- 

 matic arch 3|, at the back of ear-opening 3^ inches ; height of skull 

 and lower jaw 2f inches. The skull of the young specimen chiefly 

 differs from that of the adult in the space between the orbits and 

 masseter muscles being thicker, and in the su])raorbital process 

 before the upper hinder edge of the orbit not being developed. 

 These are the usual characters of the skulls in young animals. 



The complete hairiness of the nose at once shows that it is not 

 Lutra brasiliensis, as Dr. Krauss named it, which is the type of the 

 genus Lontra. 



It is probable that there is another species of this genus, which 

 has been described under the name of Lutra solitaria, Natterer. 

 It was obtaiued by that enterprising traveller and collector at Ypa- 

 nema, in Brazil, and is described as "chestnut-brown, and dirty 

 white beneath." 



