MACACUS. 89 



or other diseased condition of the bones might suggest itself to other observers 

 as the cause of the abnormality of the pelvis of M. cyclopis is in itself an. 

 acknowledgment of the weakness of the facts on which his generalisation is 

 based. Either the abnormality conforms to one of the forms of pelvis generally 

 induced by disease, or he was not perfectly convinced that the bones of the female 

 pelvis were perfectly healthy, although, as he states, they were free from mollities 

 ossium. The circumstance, moreover, that he describes the long bones of the male 

 skeleton as more than usually porous and soft, and that its pelvis was not so firm as 

 to be consistent with robust health, naturally detracts from the value of his statement 

 regarding the curvature of the long bones which he considers to distinguish the 

 monkey from M. rhesus, and it thus can hardly be acceded that he has demonstrated 

 that M. cyclopis possesses characters decidedly differing from those of the ordinary 

 rhesus monkey. 



I have examined the same materials on which Dr. Murie has founded his 

 generalisations regarding the supposed anatomical differences of M. cyclopis 

 from M. rhesus. The male skeleton is unusually porous and soft, and the female 

 bones, although they have none of the porous character of those of the male, are 

 extremely light, and the pelvis appears to me so deficient in earthy constituents 

 that it has a membranous appearance. The pelvis of the male, on the other 

 hand, is very porous, and has almost a friable aspect, which condition seems to 

 explain its less divergence from the normal pelvis, whereas the more membranous 

 character of the female pelvis fully accounts for its greater divergence from 

 the rhesus type. The bony substance, however, of each is very different in con- 

 sistence from the hard, heavy, compact structure of a healthy pelvis. 



In the normal pelvis of M. rhesus and its allies, a straight line drawn from 

 the anterior superior angle of the iliac portion of the bone to the inferior end of the 

 tuberosity of the ischium conforms to the external border of the ilium and cuts off 

 the lower third or nearly so of the acetabulum and the upper third or middle 

 of the thyroid foramen, according as the tuberosity of the ischium is thrown 

 upwards. 



In these details of its course across the acetabulum and thyroid foramen it con- 

 forms to the course pursued by a line drawn between similar extreme points in the 

 human pelvis. 



In M. cyclopis, however, such a line does not run parallel to and touch the 

 anterior border of the iliac portion of the bone, but encloses between it and itself 

 in the female an elongated oval space, and this occurring also in the male, but to a 

 more limited extent, proves that both pelves have the same kind of abnormality 

 depending on the downward and inward bending of the iliac portion of the bone 

 on itself. There can be no doubt that this alteration in the normal relations of the 

 constituent parts of the pelvis gives rise to a greater interval between the root 

 of the tail and the tuberosity of the ischium, but, on the other hand, there 

 is a narrowing of the interval between the callosities associated with a marked 

 general contraction of the hinder portion of the pelvis, thus reducing instead 



M 



