114 " THETIS " SCIENTIFIC RESULTS. 



orbital space ; a simple tentacle over the eye and a digitate one 

 on the snout. The first dorsal, which arises over the orbit, is 

 attached to the second at the base ; the second dorsal commences 

 low, little more than a third the height of the first spine, but 

 increasing in height ; the thirtieth ray is twice that of the first. 



The anal is much lower than the dorsal, longer posteriorly, and 

 terminates at the origin of the caudal pedicel ; the dorsal, on the 

 other hand, being attached thereto by a membrane, which how- 

 ever does not reach the caudal rays. The pectoral attains to the 

 fourth anal ray. The ventral just fails to reach the vent; its rays 

 are free for one-third their length. The caudal pedicel is long 

 and slender, its least height equal to the length of the snout; 

 the fin is lanceolate in shape The lateral line arises in advance 

 of the opercular flap, over which it forms an obtuse angle ; the 

 first thirty-three pores are crowded together, thence it suddenly 

 drops to the mid line of the body, where the pores are separated, 

 widely so, as the caudal is approached. The fish is scaleless, and 

 the muscle bands are very pronounced. 



Preserved in formaline the colour is uniform pale orange ; the 

 vertical fins are clouded, with the exception of their lengthened 

 posterior margins, which are clear. 



Total length 80 mm. 



The specimen was secured between Cape Hawke and Charlotte 

 Head in 10-12 fathoms. 



The type of C. argyroplexira was sent from Sydney. It 

 measures but two inches in length, or less than two-thirds the 

 length of ours. The figure quoted represents our example 

 tolerably, but the caudal rays are represented (if one may so say) 

 of subequal length. It has therefore been thought advisable to 

 figure the larger example. 



Fmml]i GNATHANACANTHIDtE. 



HISTIOPTERUS, Temminck & Schlegel. 



HISTIOPTERUS ELEYATUS, Ramsaij d& Ogilhy. 



(Plate xxvi.) 



Histiopterus elevatus, Rams. & Ogil., Proc. Linn. Soc. N.S.W., (2), 

 iii., 1888, p. 1311. 



Stations 5, 7, 15, 22, 34, 38, 42, 44, 47, 48, 56, 57. 



This species was established on a single and imperfect specimen, 

 and was afterwards considered by one of the authors (Ogill)y)* 



* Ogilby—Kdible Fishes, N.S.W., 188C, p. 31. 



