REPORT ON THE DEEP-SEA FISHES. 181 



deeply emarginate. The pectoral fin is very small, about one-fourth of the length of the 

 head, and situated rather above the middle of the side. Ventral fins broad and generally 

 well developed, as long as the postorbital portion of the head, and inserted opposite to the 

 anterior dorsal rays. 



The head and trunk are without scales, only one series of long lanceolate scales 

 follows the course of the lateral line. The tail is covered with small and extremely thin 

 cycloid scales, rather irregular in outline. 



Sides silvery, back and fins blackish, buccal and branchial cavities black. 



This species is known from a single specimen only, 27 inches long, and 

 obtained at Tokio, Japan. Although it is not known at what depth the fish was 

 obtained, it is evident from its organisation that it should be referred to the deep-sea 

 fauna. 



Bathysaurus. 



Bathysaurus, Giinth., Ann. and Mag. Nat. Hist., 1878, vol. ii. p. 181. 



Shape of the body similar to that of Saurus, subcylindrical, elongate, covered with 

 small scales. Head depressed with the snout produced, flat above. Cleft of the mouth 

 very wide, with the lower jaw projecting ; intermaxillary very long, styliform, tapering, 

 not movable. Teeth in the jaws in broad bamls, not covered by the lips, curved, unequal 

 in size and barbed at the end. A series of similar teeth runs along the whole length of 

 each side of the palate ; a few teeth on the tongue, and groups of small ones on the 

 hyoid. Eye of moderate size, lateral. Pectoral of moderate length. Ventral eight- 

 rayed, inserted immediately behind the pectoral. Dorsal fin in the middle of the length 

 of the body, with about eighteen rays. Adipose fin absent or present. Anal of moderate 

 length. Caudal emarginate. Gill-openings very wide, the gill-membranes being separate 

 from each other and from the isthmus. Eleven or twelve branchiostegals. Gdl-laminaB 

 well developed, separate ; gill-rakers tubercular ; pseudobranchise well developed. 

 Air-bladder absent. 



Bathysaurus ferox (PI. XLVI. fig. A). 



Bathysaurus ferox, Giinth., Ann. and Atag. Nat. Hist., 1878, vol. ii. p. 182. 



D. 18. A. 11. P. 15. V. 8. L. lat. ca. 120.' 



Adipose fin absent. 



Habitat. — East coast of New Zealand. Station 168; depth, 1100 fathoms. One 

 specimen, 20 inches long. 



' This is the number of transverse series of scales ; the number of the large scales of the lateral line is only 

 about 74. 



