PLATE 71. 



DASYBATIDAE. 



Fig. 1-2. Dasybatus guttatus. M. C. Z. 639 (Page 391). Fig. 3. Dasybatus zugei. 

 M. C. Z. 23 (Page 398). Fig. 4-5. Taeniura lymma. M. C. Z. 620 (Page 399). 



1, 3, 4. Dorsal view. 



2, 5. Ventral view. 



Rigidity of the disk around the head and the branchial chamber is secured by the elongation and 

 firmness of the propterygial segment of the pectoral base. The copula, hbr', unlike that of the Raiidae, 

 is segmented; anteriorly, in the basibranchial portion, it broadens toward the suspensorium, hyomandi- 

 bular, h)n. The ceratobranchials are more or less consolidated and enlarged, as also the basihyals. The 

 branchial ray, or rays, at the outer ends of the ceratohyals and ceratobranchials are attached to the bases 

 of the pectoral at their outer ends but are not modified. 



