408 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



in head, nearly level. Gill openings moderate, equidistant, last 

 smallest. Spiracle large, deep, little larger than eye, edges entire. 



Skin largely smooth. Spine 1% in interspiracle. A few fine 

 asperities on occiput. Large median white tubercle in center of disk, 

 surrounded by many smaller close-set flattened ones in form of 

 rhomb. 



Dorsal and anal absent; tail very long and tapering; pectorals 

 form broad rhomboid disk, hind edges very slightly convex ; ventrals 

 triangular, rather pointed; claspers short points. 



Back and upper surface of disk dark brown, below whitish. Tail 

 dusky. 



Red Sea, Arabia, Zanzibar, Natal, Cape of Good Hope, Mada- 

 gascar, Seychelles, India, Ceylon, Malay Peninsula, Pinang, Singa- 

 pore, East Indies, Siam, Cochinchina, Philippines, Northern Terri- 

 tory Australia, Queensland, Melanesia, Polynesia. WitK age the 

 middle of the back becomes studded more or less with tubercles, 

 finally extending more or less over the head, body and tail. Garman 

 says "the vertebral series apparently does not extend upon the tail" 

 which is true also of my large examples as well as the small ones. 



9053. Aboyog, Leyte. July 26, 1909. Length, 1.260 mm. Covered all over 

 above with very numerous close-set dark brown spots, crowded closely, though 

 smaller toward edges of disk. 



7635. Mouth of Melampaya River. December 26, 1908. Length, 1,445 mm. 

 Covered entirely with thick-set dark spots. 



8293. Sorsogon market, Luzon. March 12, 1909. Length, 1,027 mm. Body 

 above with small close-set dark obscure spots. 



5087. Sandakan, Borneo, Dutch East Indies. March 2, 1908. Length, 675 mm. 

 Marked with creamy spots above though larger and most conspicuous pos- 

 teriorly on disk. 



5109. Sandakan. March 3, 1908. Length, 910 mm. 



7187. Port San Vicente. November 18, 1908. This agrees in coloration and 

 armature with the Melampaya River specimen. Caudal spines 2, posterior 

 IVz in head. 



6324. Manila market. July 11, 1908. Length, 1,490 mm. 



6754. Manila market. April 20, 1909. Length, 1.690 mm. This and the pre- 

 ceding differ a little, though as both are males possibly sexiial. Both have 

 in addition to the large median tubercle at the center of the disk 11 or 12 

 forward and 4 or 5 posteriorly vertebral tubercles, all smaller. These also 

 have a more pointed snout than the others of large size and the dark spots 

 are much more indistinct or less defined, also apparently less numerous. 



U.S.N.M. No. 39983. Maryborough, Queensland. Australian Museum. Length, 

 1,250 mm. Body marked with close-set pale spots, intervening dark lines 

 forming reticulations. 



U.S.N.M. No. 39985. Port Essington. Australian Museum. Length, 1,040 mm. 



U.S.N.M. No. 72481. Batavia, Java. Bryant and Palmer. April 2, 1909. 

 Length, 178 mm. As Trygon pastinacoides. Disk entirely smooth ; caudal 

 spine 1% in head or little greater than interspiracle width. 



U.S.N.M. No. 72482. Batavia, Java. Bryant and Palmer. Length, 508 mm. 

 As Trygon ttarnacoides. 



