120 SEMNOPtTHECUS PYRRHÜS. 



to the red color of the animal the different authors have 

 followed Horsfield and accepted the distinction of S. pyr- 

 rhus from S. maurus, like J. E. Gray, 1843 (List of the 

 specimens of Mammalia, a. s. o. p. 3) and Schlegel, 1876 

 (Catalogue, Simiae, p. 56), or classed it as a variety of 

 S. maurus, like J. E. Gray, 1870 (Catalogue of Monkeys, 

 Lemurs, a. s. o. p. 15), J. Anderson, 1878 (Anatomical 

 and Zoological researches, a. s. o. p. 28) and 1881 (Cata- 

 logue of Mammalia in the Indian Museum, part I, p. 47), 

 but nobody ever has tried to compare the skulls of S. 

 maurus and S. pyrrhus and , in my view , this would have 

 been the finishing stroke. 



I now possess a rich material to study the skulls and 

 to compare the bony parts, viz: four skulls belonging to 

 individuals of different age and two skeletons of S. pyrrhus 

 and a large lot of skeletons and skulls of S. maurus. In 

 comparing the skull of an adult male of S. pyrrhus with 

 that of an adult male of S. maurus (plates 3 and 4) it ap- 

 pears at a glance that the former is much more prognath , 

 resulting from the greater development of all the teeth 

 and of the mandibles: the canines are of a much larger 

 size and the molars are stouter and stronger: very sur- 

 prising is the different form of the anterior part of the 

 lower mandibles, high and more or less as it were trun- 

 cated in *S'. pyrrhus , lower and sloping in S. maurus. 

 Among others there is to observe a very striking differ- 

 ence in the extent of the bony palate, being in S. mau- 

 rus much smaller than in S. pyrrhus (plates 3 and 4, 

 figs. 1 and 3) and less protruded backward. 



Length of upper molar series . 

 » » lower » » . . 



Greatest dimension of lower jaw 

 Length of bony palate . . 

 Skeleton with 12 dorsal-, 7 lumbar-, 3 sacral- and 27 

 caudal vertebrae. 



Notes from tlie Leyden DMuseum, Vol. XIV, 



