274 THE PLAGIOSTOMIA. 



the body and the head. Broad based, compressed, hooked tubercles in the 

 vertebral series, in front of the eye and above the spiracle, in a series on each 

 rostral ridge, and on each shoulder. 



Rusty brown, light at each side of the rostral cartilage, whitish below. 

 No black spot below the snout. 



Ceylon. 



This species differs from R. halavi in the snout, width of nostrils, internarial 

 space, rostral ridges, spiracular folds, and in coloration. It has a longer snout, a 

 wider internarial space, and smaller nostrils than H. granulatus, from which it 

 also differs in squamation and in shapes of fins. 



Rhinobattjs hynnicephaltjs. 



Rhinobatus hynnicephalus Richardson, 1846, Rept. British assoc. adv. sci. for 1845, p. 195. 



Width of disk six sevenths of the length, somewhat more than one third 

 of the total length. Snout acuminate, blunted. One fold on the spiracle. 



Color shining yellowish brown with specks of a darker tint of the same, 

 arranged for the most part so as to form small subcircular areas. (From 

 Richardson, described from a drawing). 



Canton, China. 



Rhinobattjs polyophthalmus. 



Rhinobatus (Syrrhina) polyophthalmus Bleeker, 1854, Verh. Bat. gen., 26, p. 129; Nat. tijds. Ned. Ind., 



7, p. 423; 1857, Act. Soc. sci. Ind. Neerl., 3, p. 4, pi. 4, p. 41. 

 Rhinobatus (Leiobalus) polyophthalmus Jord. & Fowler, 1903, Proc. U. S. nat. mus., 26, p. 646. 



Disk moderately broad; crown flattened, edges of slight prominence. 

 Snout about one sixth of the total length, rather pointed, from opposite 

 the orbits forming an angle of about 01°, nearly one sixth of the total length. 

 Rostral cartilage strong; ridges converging from the skull but not confluent. 

 Nostrils moderate, as wide as the space between them, which latter is little more 

 than half the width of the mouth; anterior valve rather undeveloped in outer 

 section, lobe large, inner section feeble but continued for a short distance from 

 the nostril toward the rostral cartilage; posterior valve moderate in outer sec- 

 tion, lobe elongate, inner section much larger than outer. Mouth small, one 

 third of the length of the snout, somewhat arched forward in the middle. Spir- 

 acle smaller than the eye, a prominent fold on the margin. Dorsals equal in 

 base and length of fin; anterior higher, its base one third of its distance from the 

 bases of the ventrals, or two fifths of its distance from the base of the posterior 



