398 



THE PLAGIOSTOMIA. 



disk, roughened by small spines, with a dermal fold above and a deeper longer 

 one below. A fully developed male measures in length from snout to abdominal 

 pores 9.4, in length of tail 15 and in width of disk 10 inches. 



Yellowish brown ; white beneath. 



North Carolina to Brazil, entering fresh waters. 



The mouth of this species resemble that of Dasybatus sephen but the sym- 

 physes are less pointed, that is they appear more truncate. Trygon osteosticta 

 Miill., 1835 cannot be separated from this species. 



Dasybatus zugei. 

 Plate 71, fig. 3 (skeleton). 



Trygon zugei MtJLLER & Henle, 1841, Plagios., p. 165, pi. 54, f. 1; T. Cantor, 1S49, Malay, fishes, 

 p. 426; ScHLEGEL, 1850, Jap. Pisces, p. 309; Bleeker, 1852, Verh. Bat. gen., 24, Plagios., p. 68; 

 DuMERiL, 1865, Elasm., p. 606; GiJNTH., 1870, Cat. fishes Brit, mus., 8, p. 481; Day, 1878, Ind. 

 fishes, p. 739, pi. 190, f. 3; Annandale, 1909, Mem. Ind. mus., 2, p. 33, pi. 4, f. 2. 



Trygon crozieri Blyth, 1860, Journ. Asiat. see. Bengal, 29, p. 45. 



Dasyalis zugei Jord. & Fowler, 1903, Proc. U. S. nat. mus., 26, p. 660. 



Disk subquadrangular, rounded on outer angles and posteriorly; snout 

 much produced, acute, "sharper than any other trygon," length about three 

 times the width of the interorbital space. Eyes small, eyelid nearly straight. 

 Spiracles larger than the eyes. Mouth waved, without papillae; teeth sharp, in 

 52 rows on the upper jaw of a specimen at hand. Tail nearly twice as long as the 

 body, with a short low fold above, behind the spine, and a longer deeper one 

 below. Ventrals subtriangular, anterior rays much the longer, angles blunted. 

 Disk smooth in young; older with scattered tubercles in the vertebral series. 

 Large individuals have a more or less complete median series, and have the tail 

 roughened by small spines. The greatest width is nearly opposite the mid 

 length of the body. 



In one specimen the length from snout to abdominal pores is IO5 and the 

 width 9i inches; in another the distance from snout to pores is 3i, that across the 

 disk 3|, and that from the pores to end of tail 6g inches. 



Yellowish to reddish brown; white below. 



Penang; China; India; Japan; East Indies. 



Ta^niura. 



Taeniura Muller & Henle, 1837, Sitzb. Akad. wiss. Berlin, p. 117; Wiegm. arch., p. 400; 1841, 



Plagios., p. 171. 

 Discobatis Maclay & Macleay, 1885, Proc. Linn, soc, N. S. W., 10, p. 676. 

 Discotrygon Fowler, 1910, Proc. Acad. nat. sci. Phil., 62, p. 468. 



