ox THE SHOULDER-GIRDLE AND EXTREMITIES OP ERTOPS. 365 



robust element, with both exticmities expanded, the distal much more so than the 

 proximal. The latter is truncated, with a wide oval outHne, and rests, as in land ver- 

 tebrates generally, on the coronoid pi'ocess of the ulna. The shaft is suboval in 

 section, and is much stouter than that of the ulna. The distal end is convex and 

 is horizontally expanded so as to rest on three carpal elements : radiale, ccntrale 1, 

 and intermediinn. Its inferior face is Hat distally, and the distal outline is openly 

 angulate with subequal faces; one principally for the radiale, and the other principally 

 for the intermedium. 



The carpus consists often, possibly of eleven elements. Four of these are in the 

 proximal row, viz., radiale, centrale, intei-medium and ulnarc. The second row con- 

 sists of five carpal ia. Between the two rows is centrale 2, which appears to have a 

 small centrale 3 separated from its external end, but on the palmar face, the distinc- 

 tion is not clear. The carpals are, in the order of size, as follows : ulnai-e, centrale 1, 

 centrale 2, i-adialo, carpale 5, intermedium, carpale 2, carpalia 1, 4 and 3. The meta- 

 carpals are llattcned, with the extremities truncate and expanded ; the proximal the 

 wider; the distal without indication of condyles. The thiid and fourth are twice as 

 long as wide distally, and the first is as wide as long. The fourth digit is the only 

 one in the specimen in wliicli the i>lKilanges are preserved. There are three of them, 

 the ungual very small and subconic in form, the inferior face flatter than tiie superior. 

 The two other phalanges are about as wide as long. 



MeamretnenU. MM. 



Diameters cpistcmum 



I. Slioultler-girdlc. 

 Width at anterior border of pra'corncoid 235 



I anteroposterior 110 



' transverse 130 



Greatest (inferior) width of clavicle 70 



Length of coracopr.rcoracoid on upper surface 100 



II. Anterior leg. 



Humerus, greatest width proxiniallj' '.lO 



" " " mcdiaily 40 



" distally 103 



" " length (part estimated) 130 



Ulna, length 112 



Ipro.ximally 45 



medially 15 



distally 30 



Radius, length 78 



■ proximally 42 



Radius, transverse diameter ■ medially 27 



. distally CO 



Length of carpus from ulna to m. iv 02 



Wiillli of carpu."!, proximal row 05 



Length of fourth digit 78 



