476 



TRYGONIDJi;. 



Tail without cutaneous fold, about as long as the disk. Snout 

 acutel)- pointed, projecting. Interorbital space covered with small 

 tubercles ; a narrow band of similar tubercles runs along the median 

 line of the back to the caudal spine, widening in the scapular region, 

 thus forming a sort of cross. There are a few indistinct larger tu- 

 bercles in the median line of the scapulary region, but none on the 

 tail. Disk a little longer than broad. 



Indian Seas. 



a. Adult male : skin. Ceylon. From Dr. Ivelaart's Collection. 



7. Trygon nuda. 

 Hiissell, tab. 5. 

 Trygon walga, dliill. ^- Henlc, p. 150, part. taf. oO. 



Tail without cutaneous fold, one-half longer than the disk. Snout 

 rather pointed and projecting, the margins meeting at aright angle. 

 Body and tail entirely smooth, without tubercles in old and young 

 individuals. Disk as broad as long, or rather broader. 



Indian Seas. 



a. Adult male (disk 11 inches long) : stuffed. 



b-c. Young. Singapore. 



d. Young: stuffed. India. Presented by "W. Masters, Esq. 



8. Trygon hastata. 



?? Raja centroura, Mitch. Lit. 4'- Phil. Trans. New York, i. p. 479. 

 Pastinaca hastata, Dekay, Ncio York Faun. Fish. p. 373, pi. 65. 



%. 214. 

 Trygon hastata, Storer, Mem. Amer. Acad. ii. p. 513. 



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

 anterior margins meet at a nearly right angle. From a point slightly 

 anterior to the centre of the body commences a triple longitudinal 

 scries of small horny tubercles, descending along and on each side of 

 the median line for a short distance on the anterior portion of 

 the tail. Tail armed with two spines, placed at a distance from 

 each other. Disk nearly as long as broad. Coloration imiform. 

 {Dehay.) 



New York. 



This is the description after Dekay ; however, Storer describes 

 and figures under the same name (Pastinaca hastata, Mem. Am. 

 Acad. ix. 1867, p. 244, pi. 39. fig. 3) a Sting-Ray which does not 

 show " the triple longitudinal series of smaU horny tubercles ;" so 

 that, if this character be not constant, the validity of the species ap- 

 pears doubtful. As long as the North-American Rays are not pro- 

 perly compared with series of well-determined European species, their 

 determination will remain obscure. 



9. Trygon strongyloptera. 



Trygon strogylopterus, Schondninjk, Fish. Brit. Guian. ii. p. 183, 

 pi. 22; MillL lV Trosch. in Schoinb. Iieiscn, iii. p. 642. 



