Shufeldt: Osteology of Lasiopyga and Callithrix. 85 



Fig. 17. Antero-oblique view of the skull of Seniocebus meliculosus. Some 

 teeth missing. Same specimen as shown in Plate XVI. 



Fig. 18. Direct front view of the skull of Aotus miriquouina. (Note how the 

 upper teeth overlap those of the mandible when the jaws are closed, as they are in 

 this figure.) Same specimen as shown in fig. 15 of Plate XVI above. 



Fig. 19. Lateral view of the skull of Ca//i//zn;icsp.? Dental armature complete. 

 Same specimen as figs. 13 and 14 of Plate XVI above. 



Fig. 20. Left pectoral limb of Aolus miriquouina, outer aspect, with scapula 

 and clavicle attached. Some of the bones slightly thrown from their normal posi- 

 tions. The skull shown in fig. 18 of this plate belonged to the same skeleton. 



All the figures in this plate are of natural size, from photographs taken by the 

 author. 



Plate XVIII. 



Fig. 21. Skeleton of trunk of Lasiopyga calUlrichus, left lateral view, reduced 

 rather less than one-half. Belonged to the skeleton of which the skull in PI. XII, 

 Fig. I. is a part. Coll. U. S. Nat. Mus., No. 16365. Slightly rotated in the figure 

 in order to better show the character of the pelvis, which, although belonging to the 

 lower extremity, is left attached. Photographed by the author. 



Plate XIX. 



Fig. 22. Anterior view of the pelvis, posterior lumbar vertebrae and sacrum of 

 Lasiopyga callitrichus. From the skeleton of the same individual shown in pre- 

 ceding plates (Coll. U. S. N. M., No. 16365). Natural size, photographed from the 

 specimen by the author. 



Plate XX. 



Fig. 23. Right pectoral limb of Lasiopyga calUlrichus with scapula and clavicle 

 articulated therewith. From same skeleton as figures previously given (Coll. U. S. 

 N. M.. No. 16365). Natural size, outer aspect. The total length of the humerus 

 in the specimen is 11 cm. The limb is rotated so as to show the skeleton of the 

 hand upon the dorsal aspect. Photographed by the author. 



Fig. 24. Mandible of Lasiopyga calUlrichus; seen directly from above. Same 

 jaw as shown in figs, i and 3 of Plates XII and XIII. 



Plate XXI. 



Fig. 25. Left pelvic limb, including patella, ligamentously articulated, of Lasio' 

 pyga calUlrichus, from the skeleton of the same individual to which belonged the arm 

 shown in PI. XX, fig. 23. Photographed by the author and about natural size, 

 inner aspect. Extreme length of femur in the skeleton 13.5 cm. 



Fig. 26. Mandible of Lasiopyga griseoviridis seen directly from above. Same 

 jaw as shown in figs. 2 and 4 of Plates XII and XIII. 



