276 THE PLAGIOSTOMIA. 



Specimens secured by Dr. Thomas Barbour in southern Celebes are more 

 brown than that described from Singapore. 



Rhinobatus thouini. 



La rate thouin Lacepede, 1798, Poissons, 1, p. 134, pi. 1, f. 3-5. 



Thouinian ray Shaw, 1804, Zool., 5, pt. 2, p. 318, pi. 147, f. 2. 



Rhinobatus Ihouini Muller & Henle, 1841, Plagios., p. 120; Dumeril, 1865, Elasni., p. 500, pi. 10, f. 2; 



GtJNTH., 1870, Cat. fishes, Brit, mus., 8, p. 442; Day, 1878, Ind. fishes, p. 732, pi. 190, f. 4. 

 Rhmobatus ligonifer T. Cantor, 1849, Malay fishes, p. 415, pi. 14; Bleeker, 1852, Verh. Bat. gen., 24, 



p. 59. 



Width of disk httle more than two thirds of its length. Crown flattened, 

 edges low. Snout elongate, nearly five sevenths of the width of the disk, three 

 and one fourth times the width of the mouth, constricted near the end. Ros- 

 tral cartilage long, narrow, slender, similar to that of R. halavi; ridges confluent 

 from the narrow fontanel, broadened forward. Nostrils wide, one and one half 

 times the internarial space; anterior valve feebly developed. Eyes small. Spir- 

 acles as large as the eyes, with two rudimentary folds, the inner hardly visible; 

 inner section extending half way from the lobe to the inner edge of the nostril, 

 slightly turned forward at the end ; posterior valve with the three sections about 

 equal. Mouth nearly straight, twice the width of the space between the nostrils. 

 Scales minute, sharp; larger on the middle of the back, in two groups around the 

 tubercles of the shoulders, on the top of the head and above the rostral cartilages. 

 A vertebral series of compressed tubercles, several of smaller size in front of each 

 eye and above each spiracle, and two on each shoulder, the inner one larger. 

 Dorsals subequal; anterior smaller, its base nearly three times in the space 

 behind the bases of the ventrals, and about twice in the distance from the second 

 dorsal. Caudal narrow, long, pointed. 



Light rusty brown, dorsals and caudal darker; lower surfaces little lighter. 

 The peculiarly widened extremity of the snout distinguishes this species from 

 any of the others. 



Specunen described an immature male of nineteen and three fourths inches 

 from Penang, secured by Capt. W. H. A. Putnam. 



Rhinobatus schlegelii. 



Rhinobatus schlegelii Muller & Henle, 1841, Plagios., p. 123, pi. 42; Richardson, 1846, Rept. Brit. 



assoc. adv. sci. for 1845, p. 195; Schleq-^l, 1850, Jap. Pisces, p. 207; Bleeker, 1857, Act. Soc. sci. 



Ind. neerl, 3, p. 41; Gunth., 1870, Cat. fishes Brit, mus., 8, p. 445; Annandale, 1909, Mem. 



Ind. mus., 2, p. 15. 

 Rhinobatus {Leiobalus) schlegelii Jord. & Fowler, 1903, Proc. U. S. nat. mus., 26, p. 645. 



Width of disk about three fourths of its length. Snout elongate, about 

 half the length or two thirds the width of the disk ; angle in front of orbits, about 



