394 On African and S.- American Otters. 



group of otters, witli comparatively narrow interorbital 

 region, small nasal opening, little expanded mastoid flanges, 

 and small though well-swollen bullge. Teeth light and 

 delicate, the inner lobe of ^* small. 



Dimensions of the tj^pe skull (adult male) : — Condylo- 

 basal length 103"5 mm.; basal length 94:"5 ; zygomatic 

 breadth 68 ; mastoid breadth 65 ; breadth of nasal opening 

 11*5; interorbital breadth 20; height of brain-case 37; 

 palate length 47 ; antero-posterior diameter of p* 10"6 ; 

 greatest diameter of m^ 12'7. 



Hah. Guiana and Eastern Brazil. Type from Surinam, 

 other specimens from Cayenne (Stevens), Para [Robert), and 

 Porto Peal, liio Janeiro [Hardy du Deneuf). 



Type. Adult male. P.M. no. 86. 5. 12. 1*. Collected by 

 Kappler. 



This otter was considered by Gray to be F. Cuvier^s 

 L. enudris [L. " enhydris"\ but the particulars which Prof. 

 Trouessart has been so good as to give me of the typical 

 skull of that species indicate that the latter is the larger and 

 not the smaller Guianan otter. 



7. Lutra enudris, F. Guv. 



Diet. Sci. Nat. xxvii. p. 242 (1823). _ (Guiaua.) 

 Lutra insularis, id. t. c. p. 24.3. (Trinidad.) 

 Lutra enhydris, auct. (emend.). 



Nose-pad with an unbroken band of hair passing down the 

 nasal septum between the nostrils, 3-5 mm. in breadth at its 

 narrowest point. 



Size comparatively large, about as in L. platensis. 



Skull much as hi L. j^latensis, neither specially high nor 

 flattened. Bullge well swollen. Teeth large and heavy, the 

 antero-posterior diameter of p'^ exceeding that of any other 

 species of the group. 



Dimensions of the type skull in the Paris Museum, kindly 

 furnished me by Prof. Trouessart: — Length 112 mm.; 

 breadth 80 ; j/, external length 14, greatest diameter 

 (diagonally) 15, antero-posterior diameter 13. 



Hab. Guiana and Trinidad. 



Type skull in the Paris Museum. 



Of this fine species the British Museum possesses an adult 

 male skull from Demerara belonging to a specimen now 



* Skull and skin having come separately, and a certain doubt being 

 possible as to their belonging to each other, 1 would definitely select the 

 skull as the type. The nose-pad of this specimen is damaged, but another 

 skin that came -with it shows the hairy structure particularly well. 



J 



