72 Annals of the Carnegie Museum. 



characters. In this connection it is to be noted that Mivart in 

 the aforesaid article, treating of the "Appendicular Skeleton," refers 

 to Lasiopyga but once, and that is when he sa'ys that "The index 

 digit, with its metatarsal, compared with the sp'ne, is as 38 to 100 in 

 Simla, and it varies thence down to 21 in Cercopithectis.'' I find 

 in Lasiopyga caUitrichus it is less than 18. 



The Clavicle. In this same skeleton the clavicle has a length of 4 cm., 

 and, when duly articulated with the sternum and scapula, the surface 

 which corresponds with the anterior in man, in the ape become the supe- 

 rior, and the other surfaces change aspects accordingly. This is also the 

 case in Calliihrix. In Lasiopyga griseoviridis the clavicle has a length 

 of 4.7 cm., while in C. jacchiis it has a length of only 2 cm. In all of 

 these species its form is to a large extent similar, and its mode of 

 articulation interesting. We find its sternal extremity enlarged, 

 bearing an extensive facet mesially for articulation with the sternal 

 manubiium above the costal cartilage of the first rib, the interval in 

 Callithrix being considerable and propoitionately much less in Lasio- 

 pyga. The scapular end of the bone is very much curved downward 

 especially its outer, expanded part, where it materially assists in pro- 

 tecting the articulation for the head of the humerus. This expanded 

 portion in L. griseoviridis is largely scooped out to form a notable 

 fossa, which is not as well marked as in L. caUitrichus, and absent in 

 Callithrix. When duly articulated with the coracoid and acromion 

 processes, the clavicle closes in a large, circular foramen between these 

 two apophyses and the adjacent border of the glenoid cavity, assisted 

 as it is by the scant trapezoid ligament. 



The Scapula. Lasiopyga and Callithrix have the scapula much alike 

 in all of its essential characters. Its form is not a little different from its 

 form in man. As compared with the latter, we find in Lasiopyga that 

 the superior and internal borders are of equal extent, and no very 

 definite "superior angle" occurs at their juncture, as in man, where the 

 internal or vertebral border is fully four times longer than the superior. 

 Again in the ape the spine of the scapula, which is conspicuously 

 developed, is continued to the internal border; no.t so in man, where 

 a very considerable smooth surface intervenes, over which in life the 

 trapezius muscle glides. There is no evidence of any "suprascapular 

 notch" in Lasiopyga, and the external border of the bone is much 

 thickened and profoundly grooved from the neck of the bone almost 

 to the inferior angle, the grooving being broadest and deepest at its 



