PASTINACHUS. 381 



Dasybatus microps. 



Trygon microps Annandale, 1908, Rec. Ind. mus., 2, p. 393, pi. 27; 1909, Mem. Ind. mu9., 2, p. 26, 

 fig. l,pl. 2, f. 3, pi. 4, f. 1. 



Disk rhombic wider than long, outer angles greater than 90°. Snout 

 rounded, tip of shght prominence. Eyes very small. Spiracles large, eight 

 times the ocular area. Mouth large, waved, with five papillae. Teeth with a 

 transverse ridge. Disk with numerous minute stellate-based spines, little larger 

 on the tip of the snout and around the eyes and the spiracles, in cases extending 

 to the lower edges of the pectorals. Base of tail with larger spines on the sides, 

 small ones beneath and posteriorly. Tail probably much longer than the body, 

 without fin folds, with a serrated spine, basal portion broad and flat, the distal 

 portion slender and round. 



Disk white without definite markings; tail grey above, darker backward. 



Known from the description of two specimens, 190 to 222 cm. in width. 



Bay of Bengal. 



Pastinachus. 



A cutaneous fold below the tail, none above 



disk broader than long; tubercles rounded, stellate 



tail more than twice length of body; buccal papillae 5 



brown, uniform or blotched with lighter and darker 



marinus (page 382) 

 tail more than twice length of body; buccal papillae 5 



brown, uniform or irregularly spotted; tubercles compressed 



latus (page 383) 

 tail thrice length of body; scales tessellate; papillae 5 



brown; snout sharp .... hennetti (page 383) 



tail one and one half lengths of body; angles of disk distinct 



brown, uniform rudis (page 384) 



tail nearly thrice length of disk; tubercles depressed, pointed 

 brown, tail blackish; teeth unequal; papillae 5 



sephen (page 384) 

 tail about once length of disk; spines stellate; papillae 3 



slaty grey, spotted with white . . hrevicaudatus (page 385) 

 tail two and one half lengths of disk; disk hardly as broad as long 

 brown; buccal papillae 3 ; a large round tubercle on the back 



margarita (page 386) 



