17. TKTGON. 475 



small ones in thu same median line ; otherwise the body is entirely 

 smooth. Disk a little broader tlian long. Brownish grey, with. 

 nionerons small hnnvn spots; tail blackish. 



? East-Indian archipelago. 

 «. Purchased of Hr. Frank. — Length of the disk 10 inches ; of the 

 tail 3G inches. 



4. Trygon bleekeri. 

 Blyth, Jotirn. As. Soc. Boty. 18G0, p. 41. 



" Plain dark brown above and below, with a narrowish white 

 median patch on the belly. Peak, or anterior junction of pec- 

 torals, considerably more prolonged and pointed than in the others. 

 Median third of dorsal surface studded with intermixed larger and 

 smaller round flat tubercles, continued along the upper surface of 

 the tail as far as the caudal sjHnes, then thicldy covering the whole 

 tail to its extremity in adults, or with a naked line below in 

 specimens more than half-grown. Along the median lino of the 

 tail above, the tubercles are not larger than the rest. The usual 

 large round tubercle on centre of back, and commonly three smaller, 

 set in form of a tiiangle, before it, and three similar behind it. 

 Length of one 25 inches to base of tail, the tail 72 inches; of 

 another, 15 and 56 inches." 



Bengal. 



5. Trygon walga. 



Trygon walga, Miill. ^- Henle, Pkt(j. p. 159 (descript. part., not fig.) ; 



Bleek. Verh. Bat. Gen. xxiv. Play. p. 67; Blyth, Journ. As. Sue, 



Benff. 1860, p. 40. 



hetenirus, Bleek. I. c. ; Dumeril, Elasmohr. p. 591, 



inibricata, Cant. Mai. Fish. p. 425 (not. synon.). 



dadong, Bleek. Nut. Tyds. Xed. Ind. x. p. 855; Dumiril, I.e. 



p. 591. 



Tail without cutaneous fold, rather longer than the disk. Snout 

 acutely pointed, projecting. Intcrorbital space and back of the 

 trunk covered with small tubercles, luithout larger ones in the median 

 line. A series of short spines between the root of the tail and the large 

 spines. Disk nearly as broad as long. Coloration uniform. 



East Indies. 



a. Stuffed. Bay of Bengal. From tho Collection of the Zoological 



Society. 

 h. Skin. Pinang. From Dr. Cantor's Collection. 



c. East- Indian archipelago. From Dr. Bleeker's Collection. 



d. Tj-pe of T. hetenirus. Java. From Dr. Bleeker's Collection. — 



Tail injured and deformed. 



0. Trygon polylepis. 



Bussell, tab. 4. _ 



Trygon polvlepis, Bleek. Verh. Bat. Gen. xxiv. /Vc/y. p. "-"l ; Damfril, 



'Elasmohr. p. 590. 

 walga, humeri/, L'lasmobr. p. 560 (not .-iyuon.). 



