an Amphibian from South Africa. 



345 



The scapula has a large thin blade quite smooth on the outer 

 surface, and, if the sutures are correctly recognized, is turned inwards 

 in front so as to form a horizontally placed sheet of bone on the 

 ventral surface, which is continuous with the coracoid and precoracoid, 

 which are wholly on the ventral surface of the animal. The scapula 

 above the glenoid cavity is strengthened by the development of 

 a strong buttress on its inner side near the posterior margin of the 

 blade. This results in the formation of two deep pockets on the inner 

 and posterior sides of the bone which are connected by the supra- 

 glenoid foramen. There is also a 'coracoid' foramen in the suture 

 between the scapula and the precoracoid. There is apparently no 

 glenoid foramen. It is perhaps of interest that a glenoid foramen 

 occurs in the majority of frogs, where I have observed it in the 

 genera Biscoglossus, Alytes, Bufo, Megalophrys, Scaphiopus, Nototrema, 

 Phyllomedusa, Syla, Limnodynastes, Calyptocephalus, Leptodactylus, 

 Ceratohatrachus , Rana, Breviceps, Calhdops, Rhomhophryne, Callula, 

 and Cacopus; it does not occur in Fip)a, Ilymenochwus, audi Xenopus, 



The interclavicle is a thin rounded plate of bone with no stem, and 

 the clavicles are very slender, bent at right angles, and like the 

 interclavicle scarcely at all ornamented. The cleithrum is not fully 



Pig. 5. Skull of ^Bicnodon, E. 2818. X 1. To show the interfrontal and 

 the small dermal ossifications in the orbit. 



exposed, but is, so far as seen, a very slender slip of bone lying 

 along the front of the scapula; it seems to be certain that it was not 

 continued up so as to form a cap over this bone, as in such types as 

 Eryops and Cacops. 



The humerus is a very remarkable bone ; it has only slightly 

 expanded ends, whose broad planes are at right angles to one another, 

 and the deltoid crest is both slender and short. The radius and ulna 

 are sufficiently described by the figures (Figs. 1 , 3). The carpus is well 

 ossified even in the young individual in which it is preserved, and the 

 metacarpals and phalanges are little hour-glass shaped bones. 



Dermal armour. No specimen, except Huxley's type, shows any 

 of the scutes in position, but it is probable that the whole of the skin 

 between the lower jaw and the clavicles was strengthened by a mosaic 

 of small polygonal scales. I have seen no dermal ossifications behind 

 the shoulder-girdle on either the dorsal or ventral surface. 



One specimen shows a series of 'sclerotic' plates in the orbits; 

 these are not well preserved, but seem to be restricted to the upper 



