250 Dr. A. Giinther on Deep-sea Fishes. 



Bathytroctes rostratus. 

 D. 20. A. 17. V. 9. L. lat. ca. 100. 



The maxillary reaches to below the hind margin of the 

 orbit ; intermaxillary terminating in front in a short projec- 

 tion. 



Off Pernambuco, 675 fathoms. 



Xenodermichthys, g. n. Alepocephalid. 



Body rather elongate, compressed, without true scales ; 

 the skin is rather tough, finely longitudinally wrinkled, with 

 numerous nodules, regularly arranged ; minute, rudimentary, 

 scale-like productions are imbedded in the skin, especially on 

 the trunk. Mouth very small, with feeble jaws, and rudimen- 

 tary teeth in the intermaxillary and mandible and a few in 

 the maxillary. Palate toothless. Dorsal and anal fins equal 

 in length. Caudal forked. Gill-opening wide, but not much 

 extending above the level of the pectoral fin. Gills well 

 developed, with long gill-rakers. Pseudo-branchiae. 



Xenodermichthys nodulosus. 

 D. 33. A. 33. P. 6. V. 5. 



The height of the body is nearly one seventh of the total 

 length (without caudal) ; the length of the head two elevenths. 

 Eye of moderate size, its diameter being more than the width 

 of the interorbital space. Uniform black. 



South of Yeddo, 345 fathoms. 



Halosauriis macrochir. 

 B. 12. D. 13. V. 10. P. 11-13. L. transv. 14/5. 



Snout moderately produced, its pra^oral portion forming one 

 third of its length. Eye rather small, one fourth of the post- 

 ocular portion of the head, and one half of the width of the 

 interorbital space. Maxillary reaching to the front margin of 

 the eye. The length of the head is more than its distance 

 from the root of the ventral, the origin of which is immediately 

 before that of the dorsal. Pectoral fin with narrow base^ very 

 long, extending nearly to the root of the ventral. Scales of 

 the lateral line larger than the others, each hidden in a pouch 

 of black skin, with a phosphorescent organ at its base. These 

 large scales are continued for some length on the tail, and 

 cover the base of the anal fin, which, like the dorsal, is covered 

 in its basal half with small scales. 



Altantic, 1090 fathoms ; and midway between Cape of 

 Good Hope and Kerguelen's Land, 1375 fathoms. 



