BY W. MACLEAY, F.L.S 371 



teeth are thrice as remote from one another as the anterior. The 

 second dorsal fin is not smaller than the first, and its posterior 

 lobe extends nearly to the root of the caudal. No lower caudal lobe. 



Moreton Bay. One specimen over sixteen feet in length. 



Family II. EHINOBATIDiE. 



Tail strong and long, with two well developed dorsal fins ; a 

 caudal and a longitudinal fold on each side. Disk not exceedingly 

 dilated, the rayed portion of the pectoral fin not being continued 

 to the snout. No electric organ. 



Genus Rhixobatus, Mull. & Henle. 



Body depressed, gradually passing into the tail. Cranial 

 cartilage produced into a long rostral proces, the space between 

 the process and pectoral fin being filled by a membrane. Spiracles 

 wide, behind the eye. Nostrils oblique, wide ; anterior nasal 

 valves not confluent. Teeth obtuse with an indistinct transverse 

 ridge. Dorsal fins without spine, both at a great distance behind 

 the ventral fins. Caudal fin without lower lobe. 



Troincal and Sub-tropical Seas. 



1107. Bhixobatus granulatus, Cuv. 



Mull. & Henle, p. 117, pi. 38.— Dum. Elasraobr., p. 493.— Gunth., 



Cat. VIIL, p. 443. 



Anterior nasal valve not dilated laterally. Snout produced, 

 the distance between the outer angles of the nostrils being 

 contained about once and two-thirds in that between the mouth 

 and the end of the snout. Mouth straight. Back covered with 

 very distinct rough tubercles, and with a series of large com- 

 pressed spines along the median line. Some distinct spinous 

 tubercles on the orbital margin and on the shoulder. The two 

 rostral ridges are narrow, and united nearly from the base. 

 Colour greyish with a few faint distant whitish spots. 



Port Jackson, Cape York. 



