UASYBATUS GERRARDI. 377 



them. On larger specimens the tubercles spread over head, trunk, and tail, 

 but the vertebral series apparently does not extend upon the tail. Snout to 

 abdominal pores 9, from pores to end of tail 31, and greatest width 10 inches. 



Disk brown thickly marked by small spots of darker, smaller on the head. 

 Tail with oblong spots of brown which backward become narrow transverse 

 bands separated by equal spaces of whitish. With age the spots are lost and the 

 skin becomes a uniform greyish brown. 



Indian Ocean; Red Sea; East Indies. 



Dasybatus favus. 



Trygonfavus Annandale, 1909, Mem. Ind. mus., 2, p. 25, pi. 1, f. 3, pi. 3, f. 10. 



Disk flat, pectorals even more broadly rounded than in D. uarnak; snout 

 somewhat more produced, its length five seventeenths of the length of the disk. 

 Eyes small, widely separated. Mouth waved, with two papillae. Tail rather 

 less than twice the length of the disk. No stellate based denticles. 



Dark brown with reticulations of dull yellow, a yellow spot or streak in 

 the middle of snout meshes; lower surface white. Known from the description 

 and figure, from a female 130 cm. in width; apparently a variety of D. uarnak. 



Off coast of Orissa. 



Dasybatus gerrardi. 



Trygon gerrardi Gray, 1851, Chondropterygii, p. 116; Gunth., 1870, Cat. fishes Brit, mus., 8, p. 474; 



Annandale, 1909, Mem. Ind. mus., 2, p. 24, pi. 2, f . 2, pi. 3, f. 6. 

 Trygon macrurus Bleek., 1852, Verb. Bat. gen., 24, Plagios., p. 74; Nat. tijds. Ned. Ind., 3, p. 607. 

 Trygon liocephalus Klunzinger, 1871, Syn. fische, p. 238. 

 Trygon uarnak Day, 1878, Ind. fishes, pi. 194, f. 1. 

 Trygon granulata Macleay, 1883, Proc. Linn. soc. N. S. W., 7, p. 598. 

 Himanturafai Jord. & Seale, 1906, Bull. U. S. fish comm., 25, p. 184, fig. 2. 



Disk broader than long, subquadrangular, anterior margins slightly waved, 

 meeting in an obtuse angle; outer margin convex; outer and hinder angles 

 rounded. Mouth undulated, with four papillae; teeth with a transverse ridge 

 on the crown. Skin smooth in young; older ones with one or more tubercles 

 on the middle of the back and from these a somewhat irregular series of smaller 

 tubercles extends backward and forward. Large specimens have close-set 

 spines, in pavement, on head and trunk and extending back upon the tail in 

 front of the caudal spine. Tail slender, about three times the length of the body, 

 without keels or folds, roughened on old individuals. 



