47-1 TIirQONID.B. 



a. lltilf-grown male : stuffed. Red Sea. Purchased of Dr. Riippcll. 

 6. Adult. Zanzibar. Presented by Licut.-Col. Playfair. 



c. Part of head of large example. Seychelles. Presented by Licut.- 



Col. Playfair. 



d. Adult male (body 3 feet long, tail 9 feet) : stuffed. Madras. 



Presented by T. C. Jerdon, Esq. 



e. Adult female: stuffed. Madras. Presented by T. C. Jerdon, 



Esq. 



f-g. Young : stuffed. Pinang. From Dr. Cantor's Collection. 



h-k. Young : stuffed. India. 



I. Adult. East-Indian archipelago. From Dr. Blceker's Col- 

 lection. 



m. Half-grown. East-Indian archipelago. From Dr. Blceker's 

 Collection. — One of the types of T. undulatus. 



n. Adlilt. East-Indian archipelago. From Dr. Bleeker's Collec- 

 tion. — Type of Tryrjon pareh. 



0. Young. East-Indian archipelago. From Dr. Bleeker's Collec- 

 tion. — Type of T. pastinacoides. 



p. Young. East-Indian archipelago. From Dr. Bleeker's Collec- 

 tion. — Type of T. iiarnacoides. 



2. Trygon gerrardi. 



Trygon gerrardi, Gray^ Chmidropt. p. 110. 



niacrurus, Bleek. Verh. Bat. Geti. xxiv. Play. p. 74 ; or Nat. 



Tyds. Ned. Ind. iii. p. 007, 



Scarcely distinct from T. uarnah. 



Tail without cutaneous fold, exceedingly long and slender, about 

 thrice as long as the disk, without tubercles at the base. The snout 

 ia rather obtuse, the margins forming an obtuse angle. One or 

 more largo tubercles in the centre of the back, round which, or in 

 front of which, generally smaller tubercles are grouped forming a 

 small patch or short band, and not extending beyond the central 

 portion of the disk. Disk broader than long. Brown, tuith round 

 yellowish spots limited to the posterior parts in young examples, 

 which have the tail ornamented with alternate brown and yellow 

 rings. 



East- Indian archipelago. Japan. 



a-b. Young : stuffed. India. — Types of the species. 



c. Young. East-Indian archipelago. From Dr. Bleeker's Collec- 



tion. — Type of T. macriirus. 



d, e. Half-grown. Japan. Purchased of Mr. Jamrach. 



3. Trygon pimctata. 

 Allied to T. tutrnak. 



Tail without cutaneous fold, entirely smooth, and exceedingly 

 long and slender, about thrice as long as the disk. The snout is ob- 

 tuse, the margins forming an obtuse angle. The greatest width of 

 the nasal valve is one-half of the length of the pra;oral portion of 

 the snout. Two large tubercles in the centre of the disk, a few 



