410 



THE PLAGIOSTOMIA. 



Trygonoptera testacea. 



Trygonoptcrn testacea Muller & Henle, 1841, Plagios., p. 174; Ditmioril, 1S65, Elastn., p. 629; Watte, 



1899, Mem. Austr. inus., 4, p. 44. 

 Trygonoptera miillcri Steindachner, 1866, Sitzb. Akad. wiss. Wioii, 53, p. 479, pi. 6, f. 5 (young). 

 Trygonoptera hcnlci Steindachner, 1866, loc. cit., pi. 6, f. 4 (half grown). 

 Trygonoptera auslralis Steindachner, 1866, loc. cit., p. 480, pi. 7. 

 Urolophus {Trygonoptera) testaceus Gunth., 1870, Cat. fishes Brit, mus., 8, p. 486. 



Disk subrhomboid, outer and hinder angles and margins rounded, front 

 margins nearly straight, snout bkmt-angled not produced. Spiracle with a 

 projection from the inner edgo. Nasal valves fringed. Six short papillae at 

 the bottom of the mouth. Tail Httle shorter than the disk in adults, little 

 longer in young. Dorsal fin and spine near the middle of the tail. Skin smooth. 

 Uniform reddish or brownish. 



Australia. 



Trygonoptera javanica. 



Trygonoptera javanica Martens, 1864, Monatsb. Akad. wiss. Berlin, p. 260. 

 Urolophus {Trygonoptera) javanicus Gunth., 1870, Cat. fishes Brit, mus., 8, p. 486. 



Disk little longer than broad. Thirteen papillae at the bottom of the 

 mouth. Back with lighter and with darker spots. AUied to T. testacea. 

 Batavia. . 



Trygonoptera bucculenta. 



Urolophus bucculentus Macleay, 1884, Proc. Linn. soc. N. S. W., 9, p. 172. 

 Trygonoptera bucculenta Waite, 1899, Mem. Austr. mus., 4, p. 45, f. 3, pi. 5. 



Disk including the ventrals as broad as long, anterior margins nearly 

 straight, meeting in a blunt angle; outer and hinder angles blunted. Interorbital 

 space one third of the length from the middle of the eye to the end of the snout. 

 Spiracle larger than the eye. Anterior nasal valves not extended back from 

 the narrow isthmus, outer angles rather sharp, elongate. Teeth blunt, in about 

 eighteen rows. Ventrals somewhat narrow and long. Tail shorter than the 

 disk; a moderate sized dorsal and a spine near the middle; caudal fins of 

 moderate depth. 



Dark brown on back and lower margins of disk, elsewhere yellow. 



Teeth larger, disk broader and more angular, tail shorter, dorsal larger and 

 rounder, and caudal deeper than in T. testacea. 



Australia. 



