17. TKTGON. 475 



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

 smooth. Disk a little broader than long. Brownish (jrei/, with 

 numerous small hroiun spots ; tail blackish. 



? East-Indian archipelago. 

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

 tail 36 inches. 



4. Trygon bleekeri. 

 Blyth, Journ. As. Sac. Bcny. 18G0, p. 41. 



" Plain dark brown above and heloiv, 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 spines, 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 triangle, before it, and three similar behind it. 

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

 another, 15 and 5G inches." 



Bengal. 



5. Trygon walga. 



Trygon walga, MiiU. Sf Ileiilc, P/a</. p. 159 (descript. part., not fig.) ; 



Blcek. Vcrh. Bat. Gen. xxiv. Play. p. 07 ; Bhjth, Journ, As. Sue 



Beny. 18G0, p. 40. 



lieterurus, Bleck. I. c. ; Dum6r.il, Elasmohr. p. 591. 



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



dadong, Bleek. Nat. Tyds. Ned. Ind. x. p. 355 ; Dumiril, l. c. 



p. 591. 



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

 acutely pointed, projecting. Interorbital space and back of the 

 trunk covered with small tubercles, witho it larger ones in the median 

 line. A series of short spines hetiuecn 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 the Collection of the Zoological 



Socict5\ 



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



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



d. Type of T. heteruriis. Java. From Dr. Bleuker's Collection. — 



Tail injured and deformed. 



6. Trygon polylepis. 



JRussell, tab. 4. 



Trygon polylepis, Bkek. Verh. Bat. Gen. xxiv. Play. p. 7.3 ; Diimdril, 



Ehmnwbr. p. 590. 

 walga, Dumcril, Elasmobr. p. 589 (noi t-yuou.). 



