THE LEYDEN MUSEUM. 29 



Egypt, the size of the former is slightly greater, the mark- 

 ings are eveu less defined than in Egyptian examples, the 

 horns are less closely ringed, the nasal bones are markedly 

 longer, the nasal opening is both longer and broader, and 

 the premaxillae articulate less broadly with the sides of 

 the nasal bones. The differences seem to be quite con- 

 stant, so far as we have materials for comparison, and we 

 therefore think that as the Algerian form has had a name 

 given to it, it may be provisionally retained as a sub- 

 species at least until these characters are shown to be 

 variable." 



Based upon our material ') I can add the following 

 differences between leptoceros and Loderi to those enume- 

 rated by the authors of »the Book of Antelopes". 



leptoceros, Loderi, 



general color : darker. lighter, 



tail : shorter. longer, 



ear: larger. smaller, 



knee-brushes: well developed. less developed, 



hoofs : short. elongated, 



horncore : much curved. feebly curved, 



hornrings : less than 20. more than 20. 



nasal bones : shorter. longer, 



molar series: 5G mm. 59 mm. 



In conclusion we have reason enough to regard upon lepto- 

 ceros and Loder'i as two well defined and well distinct species. 



Taurotragus oryx (Pallas). 



Although the specific title ory.v for the Eland instead 

 of oreas may be very entangling to non-systematic zoolo- 

 gists aud notwithstanding Pallas explained (Spicilegia zoo- 

 logica, fasc. XII, pp. 10 and 11) why he changed the 

 by himself formerly given' name oryx in oreas, I think it 



1) We have of Loderi a fine series of individuals, adult and young ones, 

 with bony parts, collected by Mr. Paul Spatz in Tunisia. Our leptoceros has 

 been purchased from Mr. Frank and is said to be from Somali-land. 



Notes from tlie Leytlen INIiiseiam, Vol. XXIII. 



