Shufeldt: Osteology of Lasiopyga and Callitiirix. 03 



(Vol. II. p. 533) stated that "In the still snuiUcr nujukeys {Ccrcopithe- 

 ciis) the cranial cavity forms a larger portion of the skull. In C. 

 ruber, the alisphenoid joins the parietal on the left side, not on the 

 right. The postglenoid process is pointed, and in some {Cere, albogu- 

 laris) the mastoid also." He gives a figure (Fig. 353) showing this 

 joining of the alisphenoid with the parietal on the left side, and in 

 stating that it did not do so in C. ruber on the right, he evidently 

 considered the character constant in that species, in which I am 

 forced to belie\e that he was mistaken. Mivart states that "In 

 Nyctipithecus the alisphenoid is almost shut out from the parietal by 

 the close approximation of the squamosal to the malar," which is 

 doubtless true.' Low down in the temporal fossa in C. jacchus, the 

 shortened wing of the sphenoid makes quite extensive contact with 

 the parietal, and the malar bone here may be pierced by one or two 

 large perforating foramina, which lead into the back of the orbit. 

 There may be only one of these, or they may be absent. No such 

 foramina aie to be found in Lasiopyga. All these apes possess an 

 osseous meatus auditorius externus, leading directly into the auditory 

 bulla in Callithrix, where no auditory process is present, the latter 

 only being conspicuously developed in Lasiopyga. 



Viewed from above, it will be observed that there are some very 

 striking differences in the skulls of Lasiopyga callitrichus and L. 

 griseoviridis (PI. XIV, figs. 5 and 6). In L. griseoviridis the promi- 

 nent orbital arch almost conceals the orbits from view; which is not 

 the case in L. callitrichus. Again, in L. griseoviridis, the temporal 

 ridges aie conspicuously developed, but are practically absent in L. 

 callitrichus. In both these apes, no parietal foramina are met with, 

 though I have never as yet failed to find them in the skull of man.* 



3 On the left side in the skull of a Pongo, collected by Dr. W. L. Abbott on 

 August II, 1907 (West Borneo, Bayu, Sempang River), and now in the collection 

 of mammalian skeletons in the U. S. National Museum (No. 145,322), there is a 

 temporo-frontal articulation, which separates the alisphenoid from the parietal 

 by several millimeters; while on the left side of the skull of Simla (No. 142,202, 

 Coll. U. S. Nat. Mus.), collected by Dr. W. L. Abbott in West Borneo in 1905 

 (Sakaiam River), the arrangement is the same as in the vast majority of human 

 skulls, that is to say, the alisphenoid articulates with the temporal, the parietal, 

 the frontal, and the malar. 



* Since this was written I have undertaken the examination of some seven 

 thousand human skulls in the collection of the U. S. National Museum, with a 

 view to obtaining certain data from them. These skulls are of both sexes and all 



