12 BULLETIN OF THE LABORATORIES 



The strongest bone in the shoulder girdle is the coracoid, which 

 is expanded below and obHquely winged for a short distance, then 

 is cylindrical and then curves inward, throwing off a flange-like 

 process where the scapula is articulated, and ends in an articular 

 surface against which the flattened upper part of the clavicle is 

 pressed. From the lower angle of this surface a strong tendon 

 passes to the process of the manubrium on that side. The clavicles 

 are of the usual form, forming the merry-thought in connection with 

 the anchylosed interclavicle. The scapula is united to both clavicle 

 and coracoid and with the latter furnishes a glenoid surface for the 

 humerus. Between these three bones, at their union, is a cavity, fora- 

 men triossetun^ permitting the passage of the tendon of the sub-cla- 

 vius muscle. 



The anterior extremity is of moderate size. The humerus is .95 

 long and is much expanded proximally where it is .33 in breadth. 

 The radial crest is short and quite prominent. The ulnar tuberosity 

 is very large and outwardly presents a large triangular surface and 

 within excludes two extensive fossoe, divided by a strong septum, from 

 the end of which a strong process is developed. The opposite or 

 distal end of the humerus is less highly developed, but still shows a 

 high degree of perfection of the spinous appendages. The trochlea, 

 consisting of the radial and ulnar tubercles, are about as usual. The 

 radial condyle is a small prominence directed forward at the base of 

 the radius, while the ulnar condyle is a larger acute process, extending 

 in the opposite direction. The radius, the smaller bone of the arm, 

 is but slightly curved and measures 1.20 in length. The ulna curves 

 considerably, proximally, so that the sigmoid cavity is quite oblique to 

 the shaft, and the olecranon process is small and styloid. The carpus 

 contains two bones which have the usual positions. The ulnare is 

 applied to the back side of the ulna and rotates upon its smooth articu- 

 lar surface. The radiate caps the ulnar and is overlapped by the ra- 

 dius in front. The three metacarpals are fused at the base. The 

 first one can not be distinguished and its phalanx measures but . 20. 

 The second metacarpal is .65 long and is fused at both ends with the 

 slender third metacarpal. The second digit consists of two phalanges, 

 the first of which is .30 long and consists of two bars connected by a 

 thin plate of bone, the second being a triangular plate .15 long. The 

 third digit consists of a styloid phalanx .20 long. (The two ossicles 

 described by Schufeldt, in certain birds, as the cuneiform and the pen- 

 tosteon, are not discoverable in any of the skeleta before me. 



