DASVIiATIS NAYARRAK. 393 



tail one and one half lengths of body; back smooth to rough; papillae 5 

 lnown, olive to greyish; tubercles broad based, in vertebral and 



scapular rows brevis (page 396) 



tail nearly two lengths of body; back roughened; papillae 5 



brown, yellowish to dark; tubercles narrow, depressed, in median 



row on large specimens .... sabinus (page 397) 



tail nearly two lengths of body; back smooth to rough, tubercles in 



median row on large 



brown, yellowish to reddish; no buccal papillae . zugei (page .398) 



Dasybatus sinensis. 



Trijgon sinensis Steindachner, 1892, Anz. Akad. wiss. Wien, 29, p. 133; Denk. Akad. wiss. Wien, 69, 

 p. 382, taf. 6. 



Form rhomboid, approaching that of D. imbricatus but less produced in the 

 snout and rather more convex opposite the spiracles. Disk wider than long; 

 outer angles bluntly rounded; snout sharp; front margins waved, hinder weakly 

 curved, and shorter; hinder angles sharply rounded. Mouth waved, with 

 five papillae at the bottom, three close together forward and two much farther 

 back. Eyes small; spiracles much larger. Tail slender, whip-like, about 

 one and one half times the length of the disk, with a dermal fold below and a 

 lower one above. Roughened with small scales above the snout, head, gills 

 and along the vertebral column from the head back toward the caudal spine. 

 Scales a trifle larger at the median line. 



The type a mature male was 34.5 cm. in length to behind the vent and 39.5 

 in width; it had no large tubercles, and was uniform in color. 



Shanghai. 



Dasybatus navarrae. 



Trygon navarrae Steindachner, 1892, Anz. Akad. wiss. Wien, 29 p. 132; Denk. Akad. wiss. Wien, 59, 



p. 381, taf. 5. 

 Dasyatis bennetti Jordan & Richardson, 1910, Mem. Carn. mus., 4, p. 164, pi. 65. 



Disk rhomboid, broader than long, snout produced and sharp at the end, 

 anterior outlines somewhat waved. Distance from outer angle of disk to end 

 of snout about equal that to the vent. Outer angles blunter than hinder. 

 Mouth waved; teeth of male with slender sharp cusps resembling those of the 

 large tubercles on the tail; three papillae at the bottom of the mouth. Eye 

 small; spiracles much larger. Tail, probably twice the length of the disk, with a 



