204 MISS JOAN B. PROCTER ON THE VARIATION 



Pelobates Wagl. 



P. fuscus Laur. — Scapula well developed, thick, once and a 

 half as long as prsecoracoid. Shaft oblong, twice as long as 

 broad ; pars acromialis broad, the lower border of its outer 

 surface with a ridge which runs round the glenoid cavity ; pars 

 glenoidalis much depressed ; dividing cleft short, forming an 

 oval foramen pierced horizontally. 



Example. 



Length of prsecoracoid 10 units. 



„ scapula (lower edge) 15 ,, 



,, ,, shaft 10 - 4 ,, 



Breadth of „ (distal end) 5 „ 



Length of supra-scapula (lower border) 15 ,, 



P. cidtripes Cuv. — Scapula precisely as in P. fuscus. 



Pelodytes Fitz. 



P.punctatus Daud. — Scapula much reduced, squarish in shape. 

 Shaft shorter than broad at distal end ; pars acromialis as broad 

 as long, lower border of its outer surface forming a prominent 

 ridge running round the glenoid cavity ; pars glenoidalis much 



Text-figure 7. 



^C 



Pectoral girdle of Pelodytes punctal us. X2. 

 (a) from without; (b) scapula from within. 



depressed, subcircular ; dividing cleft short, pierced horizontally, 

 only visible when viewed obliquely. 



Example. 



Length of pra?cora.coid 1 units. 



,, scapula (upper border) 5"6 ,, 



» shaft 4-4 „ 



Breadth of „ (distal end) 4-4 „ 



Length of supra-scapula (upper edge) 9-4 „ 



In shape the scapula, of Pelodytes is very similar to that of 

 PaltTobatrachus, which it resembles in many ways. Palceoba- 

 trachus, however, lacks the proximal dividing cleft, which, 

 though outwardly invisible, is present in Pelodytes. 



Batraciiopsis Blgr. 



B.-melanopyga Doria. — Scapula well developed, about once and 

 a quarter as long as prsecoracoid ; slender in the middle, 



