ME. ST. G. MITAET ON THE SKELETON OF THE PRIMATES. 219 



In these last six figures, a represents the articular head ; //, the bicipital groove ; 

 c, rough surface, probably for the coraco-hracliialis ; d, the lesser, or ulnar, tuberosity ; 

 e, the greater, or radial, tuberosity ; Ic, the external condyle ; m, the perforation in tlic 

 coronoid fossa ; o, the internal condyle ; p, the capitellum ; q, the trochlea ; s, musculo- 

 spiral groove. 



PLATE XXXVII. Clavicle and Eadius. 



Fig. 1. Anterior surface of the right clavicle of the specimen No. 3 C in the British 



Museum. 

 Fig. 2. Superior surface of the same. 

 Fig. 3. Inferior surface of the same. 

 Fig. 4. Anterior surface of left clavicle of the variety Morio. 



In these figures, a represents the acromial end of the bone ; c, the tubercle for the 

 conoid ligament; d, the prominence for the deltoid; p, ridge probably for pecforalh 

 major; r, rough surface for costo-clavicular ligament; s, sternal end of the bone; 

 t, ridge for trapezoid portion of coraco-claricular ligament. 

 Fig. 5. Anterior surface of the right radius of specimen No. 3 B. 

 Fig. G. Posterior surface of the same. 

 Fig. 7. Posterior sui-face of distal end of the same, showing the grooves for the extensor 



tendons completely. 

 Fig. 8. Distal surface of the same. 



a, process for the supinator longus ; b, tuberosity' ; f, the styloid process ; ff, surface 

 for ulna ; h, the surface for the scaphoides ; k, groove for extensor ossis metacarpi 

 poinds ; I, that for ex. carpi radialis longior ; m, that for the ex. carpi radialis hrevior ; 

 0, that for the extensor secundi internodii pollicis ; ^j, that for the extensor communis 

 digitorum ; u, the sui-face for the semilunare. 



PLATE XXXVIII. Ulna. 

 Fig. 1. Anterior aspect of right ulna of the specimen No. 3 C. 

 Fig. 2. Ulnar (or inner) aspect of the same. 

 Fig. 3. Posterior aspect of the same. 

 Fig. 4. Radial (or outer) aspect of the same. 

 Fig. 5. Posterior surface of the olecranon of the same. 

 Fig. 6. Side view of the distal end of No. 3 A. 

 Fig. 7. Distal sui-face of ulna of No. 3 A. 



a, radial or outer margin; b, nutrient foramen; c. fossa for brachialis anticus; d, 

 lesser sigmoid cavity ; e, ridge running downwards and backwards from tliat ca\ity ; 

 /', surface for anconceus ; g, greater sigmoid cavity ; k. the distal articular surface ; 

 s, styloid process ; x, ridge for attachment oi2)ronator quadratus. 



2 II 2 



