OF THE SCAPULA IN THE BATRACHIA. 



201 



Exainfle. 



Length of prEecoracoid , 



,, scapula 



., ,, (fi"ee vipper adge) 



„ ,, shaft 



Breadth of ,, (distal end) 



,, ,, (least) 



Length of supra-sea piila 



10 units. 



3-9 ., 



1-9 „ 



M „ 



2-6 „ 



1-8 „ 



9-2 „ 



Text-fioure 4. 



Pectoral girdle o( Pipa americana. X2. 

 (a) from witliin ; (h) scapula from without. 



Arcifera. 



In all the Arciferous genera in which I have studied the 

 scapula, its three main branches are all present, even if one or 

 more of them is reduced. The pars acromialis is more or less 

 separated from the /»«rs glenoidalis by a cleft or foramen. 



DiSCOGLOSSIBJE. 



As in Pipidce the scapula is greatly reduced. The jt5«?-s 

 acromialis more or less overlaps the x)(^'>'s glenoidalis, so that the 

 cleft which separates them can onl}^ be seen when viewed 

 obliquely. 



DiSCOGLOSSUS Otth. 



D. pictus Otth. — Scapula much reduced, its greatest length 

 only half that of the prsecoracoid . Shaft vestigial; pars 

 acromialis well developed, but sliorter than ^jff?-s glenoidalis ; not 

 overlapped by head of prsecoracoid ; pars glenoidalis well de- 

 veloped, strongly depressed, the separating cleft pierced hori- 

 zontally. In eight skeletons of this species there appears to be 

 no individual variations, 



