184 SUS-STUDIES. 



stumps, that the anterior palatine foramina are mere oval 

 shaped openings in a bony mass, a. s. o. In the two other 

 mentioned skulls the premaxilla protrudes 6 mm. The 

 female-skull too has all the molars very used and the 

 hindmost incisors have disappeared ; the bony palate is in 

 the middle as it were deeply hollowed ; nasalia roughened 

 as a feeble imitation of these bones in the male-skull. Very 

 striking in celebevsis is the small size of the molars in 

 general and specially of the hindmost upper and lower 

 molars; in the very adult male-skull, without about any 

 trace of sutures, having nearly all the molars worn out 

 and very used, the last upper molar measures 24 x 15 mm. 

 and the last lower molar 25 X 15 mm. (cf. measurements of 

 adult skulls of vittatiis). The skull has not an elegant 

 shape, but it has more the broad form of verrucosus, espe- 

 cially in the very adult male-skull. Profile-line always 

 somewhat concave, in adult skulls rather deeply concave 

 on the nasal bones. No skull nay the extremely adult male- 

 skull above mentioned shows any tendency to form a crista, 

 the smallest distance between the parietalia above being 

 still 31 mm., in the adult female-skull from Forsten's col- 

 lections the distance is 19 mm. Although as I pointed out 

 the male- as well as the female-skull both belong to very 

 adult specimens, they however present a very remarkable 

 difierence in size, the male-skull is a good deal longer 

 than the female one, the difference being here much greater 

 than in the other species: 



cT ad. 9 ^d. 



greatest length 307 mm. 258 mm. 



greatest width 135 » 111 » 



length of bony palate. . . 190 » 158 » 



The younger male-skull presents the measurements of 

 the adult female-skull, the differences may be called im- 

 perceptible. 



The here discussed adult male-skull is the very specimen 

 figured in the » Verhandelingen" ; it is a very accurate 



Notes from tlie Leyden IVIuseuxxi, "Vol. XJX."VI. 



