130 Messrs. J. Wood-Mason and A. Alcock on 



The widely-distensible mandible projects mucli beyond the 

 upper jaw. Five large, distant, fixed fangs in each premaxilla, 

 as well as a freely movable one near the symphysis ; a_ few 

 minute, inconspicuous, distant denticulations in the maxillae ; 

 eight or nine moderate-sized laterally-projecting fangs on each 

 limb of the mandible, decreasing in size from before back- 

 wards ; a fang on each side of the vomer, and two small, 

 distant, incurved teeth on each palatine. 



The barbel, which is as long as the caudal fin, is trifid at 

 its extremity. Opercular bones membranaceous. 



No scales ; the body, which is coated with tenacious mucus, 

 is mapped out into silvery hexagonal areolae. There are on 

 each side along the ventral surface of the body two rows of 

 small luminous organs ; the internal extends from the man- 

 dibular symphysis to the base of the caudal, but, owing to the 

 denudation of the integuments of the tail, the number of its 

 constituents cannot be determined beyond the origin of the 

 anal fin, up to which point there are 57, namely, to the base 

 of the pectorals 9, to the base of the ventrals 51, to the origin 

 of the anal 57 ; the external extends from the base of the 

 pectoral to the origin of the anal, and numbers 45. There 

 is a single luminous organ on the barbel and a row along the 

 base of the branchiostegal rays. The dorsal fin arises at the 

 level of the third anal ray. Caudal pointed, its length is 

 about one twelfth of the total. The pectorals, which arise 

 near the ventral profile, are equal in length to the caudal. 

 The ventrals are very long, reaching to the sixth anal ray. 



Colours in the fresh state : — Jet-black, with silvery hexa- 

 gonal markings. 



One specimen, a little over 5 inches long, from Station 107, 

 738 fathoms. 



Family Clupeidse. 

 Bathyclupea, gen. nov. 



Head and body compressed, the former with the mucous 

 cavities highly developed. Abdomen neither serrated nor 

 keeled. Mouth with the lower jaw strongly prominent. 

 Small teeth in the jaws, palatines, and vomer. Gill-openings 

 very wide, the membranes entirely separate ; 7 branchio- 

 stegals ; pseudobranchice large. Body covered with large 

 deciduous scales ; lateral line distinct. Dorsal fin situated in 

 the posterior half of the body, arising behind the origin of 

 the elongate anal. Pectorals very large, entire. Ventrals 

 small or rudimentary, sithjugular in 2)Osition. Caudal forked. 

 Pyloric appendages in moderate number. 



