PLATE 72. 



Fig. 1-2. Ptehoplatea altavela. (Page 415). 



Except in what is more directly affected by the broadening of the body and the pectorals this genus 

 exhibits no great departure from the other Dasybatidae. The copula is segmented, the propterygial 

 segment of the pectoral base is strong and elongate and reaches slightly beyond the antorbital, the 

 ceratobrancliials, cbr, are fused at their inward ends, and the basihyals form a large broad shield-like 

 plate. The shoulder girdle has been mollified in several particulars; the pectoral bar, /ict, has widened 

 and the scapular bracts to the pro- nie-so- and metapterygia have elongated, though the .scapula, sc, from 

 which they extend outward, is comparatively little changed. 



