92 THE VOYAGE OF H.M.S. CHALLENGER. 



smaller. Numerous specimens were obtained by the " Knight Errant " in the Faroe 

 Channel, in 530 fathoms, the largest being 12 or 13 inches long, at Station 6, in August 

 1880, and Station 2, in August 1882. 



I formerly believed that these specimens represented the younger stage of the large 

 specimen from Madeira (the only one known to me at the time) which I referred in 

 1862 to Risso's fish; but examples received at a later period convinced me that the 

 present species may be constantly, at all ages, distinguished by a comjDaratively larger eye 

 and shorter head. However, the three European species, viz., Haloporphynis guentheri, 

 HaIoporphy)-u.<i lepidion, and Halopoiphyrus eques are most closely allied to each 

 other. 



Halopoiphyrus inosinuv, u. sp. (PI. XX. fig. B). 



B. 7. D. 5 I GO. A. 52. Cfcc. pyl. 13. 



This species is also very similar to Halop)orphyrus lepidion, but distinguished by 

 much smaller scales. The length of the head is conspicuously less than the distance 

 between the root of the ventral fin and the anal. Eye rather large, one-fourth of the 

 length of the head, equal to the length of the snout and more than the width of the 

 interorbital space. The rows of pores in the praeorbital region are present as in Halo- 

 porphyrus lepidion and Halopoipliyrus equea, but the pores are much smaller. The 

 mouth scarcely extends to below the middle of the eye. Barbel nearly as long as the 

 eye. The caudal peduncle is rather slender, its depth being two-thirds of the distance 

 between dorsal and caudal fins. Scales very small, about twenty longitudinal series 

 between the anterior dor.sal fin and the lateral line. The first long doi-sal ray is rather 

 feeble, extending scarcely to the middle of the length of the dorsal fin. Middle of the 

 anal fin but little depressed. Caudal fin subtruncated. Pectoral fin three-fifths as long 

 as the head, equal in length to the filamentous ventral. 



Brownish, with blackish fins ; the cavities of the mouth, gills, and abdomen black. 



ITahitat. — Several specimens, from 8 to 12 inches long, were obtained by the 

 Challenger at Inosima, in 345 fathoms. 



Ilaloporphyt-us ensiferus, n. sp. (PI. XIX. fig. A). 



B. 7. D. 5 I 52. A. 46. V. 8. Cax-. pyl. 10. 



Distinguished by the very broad and compressed dorsal ray. The length of the 

 \wm\ equals the distance between the root of the vcntrals and the vent. Eye rather 

 large, two-sevenths of the length of the head, a little longer tlian the snout, and in 

 widtli much exceeding the interorbital space ; i)ores of the prseorbital region very 



