OF THE SCAPULA IN THE BATKACHIA. 



199 



PlPID^E. 



As in Pal(soh7'atrachus, the gener.a of this family have tlie 

 scapula entii'B, without the cleft which separates the jijars 

 acrotnialis from the 2^(t''>'s glenoidalis, at least partially, in all other 

 families. This, together with the marked reduction of the 

 scapula, constitute diagnostic characters for the Pipidae. 



Xenopus Wagl. 



X. Icevis Daud. — Scapula vestigial ; subtriangular. Shaft and 

 pars acromialis completely absent ; /)ars glenoidalis containing 

 the circular depression of the glenoid cavity. Head of prrecora- 

 coid in contact with supra-scapula. Occasionally the scapula is 



Text-figure 3. 



-J 



Pectoral girdle oi JLenopus Itevis. X2. 



{a) scapula distinct ; from without. 

 {h) scapula not distinct ; from within. 



apparently wanting, having fused with the head of the prfecora- 

 coid ; in most specimens this fusion is more or less marked, 

 making the boundaries of the vestigial scapula difficult to trace. 



Example. 



Length of praecoracoid 10 units. 



,, scapula (at base) 2*4 ,, 



Breadth of ,, (expanded end) 2*1 „ 



Length of supra-scapula 10'3 ,, 



X. muelleri Ptrs. — Scapula as in X hevis. A figure of the 

 pectoral girdle is given by Peters *, in which it is absent. In 



* Peters, ' Reise nach Mossambique ' (1882) Taf. xxvi. 12 a. 



