726 DR. J. MURIE ON MACACUS MATJRUS. [Juue 4, 



eight. The foremost three caudals have a large spinal foramen ; and 

 in two the neural laminae meet but are devoid of spine ; in the third, 

 ossification of the neural element is imperfect. The transverse pro- 

 cesses of the three diminish from before backwards, and in the 

 succeeding fourth caudal are reduced along with laminar structure 

 to mere rudiments. The succeeding vertebrae, altogether smaller, 

 are laterally compressed, deficient in processes, and the final and 

 antepenultimate ones tiny ossicles, requiring good eyesight to distin- 

 guish them. A few diminutive cartilaginous-like nodules on the 

 under surface of the caudal vertebrae I take to be rudiments of 

 chevron bones. As I have shown in fig. 1, the tail barely reaches 

 the tuberosity of the ischium, or at most is vertical to its upper 

 anterior prominence. 



The caudal vertebrae have terminally a very slight upward curve, 

 and veer a trifle to the left of the median line. 



In a roughly cleaned specimen of the pelvis of the Ashy-black 

 Macaque (M. ocreatus) in the British Museum I fiud the caudal 

 region to be very like the one under immediate consideration. The 

 terminal ossicles seem more numerous by one or two ; but in absence 

 of processes beyond the third and inclination to the left it agrees ; 

 whilst in the upward bend it is more curled forwards, terminally 

 being tipped by fibroid tissue. 



The skull, compared with those of the genus generally, is of the 

 true Macaque type. Facially the supraorbital ridge is well marked 

 and prominent, with high superior external orbital angles. The 

 outer edges of the latter drop perpendicularly to the malar bone ; 

 and there is such incontestable flattening of the anterior surface of 

 the orbito-jugals and ascending maxillary process, as to give a very 

 characteristic squareness to the superior half of the face. In old 

 skulls of the Rhesus the orbital facial moiety approaches the condi- 

 tion here spoken of, but not so those comparable in age with ours. 

 Moreover their malar arch is much curved and stands well out, 

 whereas in M. maurus it is flat and by no means prominent. 

 Neither of the square-visaged Monkeys (M. cyclopia and M. assa- 

 mensis) agrees with the Moor Monkey in the above characters ; and 

 they, as well as M. rhesus, have a fulness in the muzzle or maxillo- 

 premaxillary region. 



In profile the skull inclines to shortness, the contour otherwise 

 agreeing best with the Assam species. This is particularly the case 

 in an anterior depression of the frontal, which is also slightly ob- 

 servable in M. radiatus and M. cyclopia. In the other Macaques 

 there is an elevation at this spot, it being greatest in M. speciosus. 

 I speak of adolescent skulls only ; for as age progresses the supraor- 

 bitals become so prominent as entirely to alter the relation of parts. 



The parieto-occipital region is but moderately full, the sagittal 

 line being elevated more than the average in the genus. The coronal 

 region is low, which gives a flattish crown, therefore unlike M. spe- 

 ciosus. 



In this young female the stomach had an elongate pyriform shape, 

 the pyloric end, however, not being so narrow and drawn out as 



