114 MUSTELID^, 



flesh-tooth of the lower jaw oblong, more than twice as long as 

 broad, with three large anterior and one very large posterior lobes ; 

 the hinder or tubercular grinder moderate, with a nearly circular 

 crown. 



Pteronura, Gray, Loudon's Mag. Nat. Hist. 1837, p. 580 ; P. Z. S. 

 1865, p. 134. 



Pteronunis, Lesson. 



Pteruxa, Wiegm.; Schinz. 



Pteronura Sandbachii. B.M. 



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. p. 580, 1837 ; 



Ann. Sf Mag. N. H. ii. p. 285, t. 14, 1839; P. Z. S. 1865, p. 131 ; 



1868, p. 66, t. 7 (and skulls). 

 Pterm-a Sandbachii, Wiegmann's Arch. iv. p. 392, 1838(publislied 1839). 



Hob. Demerara {Mus. Roy. 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. Kapplerl. B.M. 



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

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

 each side of the thi-oat, which is dilated behind, and one branch of 

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



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

 Lutra brasiliensis, Krauss, Mus. Stutgardt. 



Hah. Surinam (Kappler). 



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

 hand magnifier. 



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

 the orbit 4^, 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 2J 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 supraorbital process 

 ,J«;fore the upper hinder edge of the orbit not being developed. 

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



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

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

 genus Loyitra. 



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

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

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

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

 white beneath." 



During the first visit of the British Association to Liverpool in 

 1837 I observed a depressed-tailed very large-footed Otter in the 



I 



