332 



MERISTIC VARIATION. 



[part I. 



referred to which meets a similar one from the normal ulna [Fig. 89, II]. 

 On the front of this there is a small articular surface looking forward 

 which suggests a part of the convexity of the head of the radius. The 

 upper articular surface shews a fissure separating it from the side of 

 the olecranon which is not found in the normal ulna. These projections 

 which touch each other are held together by a strong interosseous liga- 

 ment. The lower end of this ulna is very like the other, only somewhat 

 broader. The mode of union of the lower ends could not be seen without 

 unwarrantable injury to the specimen. There can hardly have been 

 any definite movement between these bones. Perhaps the ligaments may 

 have permitted some irregular sliding, but it is impossible to know. 

 These bones have been described first because their nature is very clear 

 and, once understood, is a key to the more difficult interpretation of the 

 lower end of the humerus." 



The upper end of the humerus presented nothing noteworthy. A 

 detailed description and figures are given, from which it appears that 

 the lower end of the humerus had such a form as might be produced 

 by sawing off the greater part of the external condyle and applying in 

 place of it the internal condyle of a right humerus. 



The carpus seen from the dorsal side had the structure shewn in the 

 diagram (Fig. 92). The proximal row consisted of three bones besides 

 the two pisiforms (p l and p 2 ). There was a cuneiform at either side of 

 the wrist, and between them a bone evidently composed of a pair of 

 semilunars, having a slight notch in its upper border. At each end of 



Fig. 92. Diagram of the carpal bones in the left hand of No. 492 from the 

 dorsal surface. 



pis 1 , cu 1 , u 1 , m 1 , pisiform, cuneiform, unciform and magnum of the external or 

 normal half of the band consisting of four fingers ; pis*, cu 2 , u 2 , m 2 , the similar 

 bones for the internal group of three fingers. Zu 1+2 , the compounded lunar 

 elements corresponding to the two groups, x, bone placed as trapezoid. 



(After Dwight.) 



the second row is an unciform bearing the middle and ring fingers. 

 Next came two ossa magna very symmetrically placed, each bearing the 

 metacarpal of a medius. Between these is a bone which Dwight states 



