226 



THE EXTINCT BATRACHIA, REI'TILIA 



of a ridge which disappears opposite the superior or condyloid tuberosity. The latter is small, but very prominent, and 

 with striate sides. The articular facets for the radius and ulna, form together a curve. The inferior condyloid pro- 

 cess is the most prominent and massive of all, the smooth extremity sub-triangular, acuminating to the ulnar articu- 

 tion. Its sides are rugose. 



While the proximal extremities of the ulna and radius are not in exactly the same plane, the distal are; the ulna 

 is the twisted bone. It has a tuberosity in place of an olecranon, which is not very prominent; it is partly covered by 

 a reflected portion of the area capped by articular cartilage, Distally there are three articular facets, the middle the 

 largest. This with the inner seem adapted to the ulnar and intermedial earpals. The radius has but one articular 

 face distally. It is a very wide bone, expanded into a semi-disc, which increases the width of the paddle, and conse- 

 quently the natatory power. Both those bones are striate near the articular surfaces, and most so proximally. The 

 posterior face of the proximal end of the ulna is the concave one; of the radius, it is the convex. 



The radial carpal is the largest of the first row. It presents a free edge towards the inter-osseous space, which 

 is exceedingly short, and margins a prominence in the otherwise oval outline. There are two distal articular facets, 

 and one interior. The bone I have supposed to he the intermedial is concave on the inter-osseous face, and presents 

 two sub-equal distal articular facets, one shorter superior, and two inferior facets. The ulnar carpal is thicker than 

 the intermedial, but not large, and considerably smaller than the radial. It has two distal and one superior facet. 

 All the oarpals are delicately striate, but not medially—only near and at right angles to the articular facets. The 

 outline of the inter-osseous space is a wide elongate oval, not quite symmetrical. 



Tn. 

 Length from head humerus to second row earpals. ;{ 



" humerus, I 



Width proximally, 

 " medially, 

 " distally. 

 Thickness head and greater tuberosity. 

 Length ulna, 



" radius, 



1 head, 

 ' shank, 

 ' distally. 



Width 



ulna 



2 



" " shank, 



" " proximally, 



" inter-osseous space (transverse), 

 " earpals first row, 

 Length radiale, 

 " intermedium, 

 " ulnare, 

 Width 



" radiale, 

 Thickness " 



Length coracoid (antero-posterior), 



Width " (inferior), 



Length " anterior limb, 



" " posterior " 



" proximal extremity of scapula, 



Diameter (long) of glenoid cavity, 



The head of the os quadratum furnishes a, tripodal cartilage capped face; the anterior, narrowest, is the margin of 



the large anterior ala; the posterior, the wi.lest and longest, descends behind the auricular meatus, andis curved out- 



Lin. 

 6.8 



9.5 

 15.5 

 10.5 

 20. 



0.5 

 1(! 

 18.5 



0.5 



7 

 10. 

 11.5 



(i 



11.5 

 10.5 



4 

 11.3 



8.0 



8.!! 



7 



8.5 



8. 



1. 



0.7 

 20.4 

 11.5 



0.5 

 11 



