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



being confluent and not attached to the isthmus. Gills four. Air-bladder in the 

 posterior half of the abdominal cavity, mth a pneumatic duct, with rather stiff walls, 

 and glandular internal surface. Peritoneum deep black. Kerguelen Island. 



Murcenolepis marmoratus, n. sp. (PI. VIII. fig. B). 



Body compressed, its height equals the length of the head, and is contained five and 

 a half to five and three-quarter times in the total length. Head compressed like the 

 body, higher than broad, its greatest width being three-fifths of its length. Interorbital 

 space slightly convex, equal in width to the diameter of the eye, which is rather less than 

 one-fourth of the length of the head. Snout obtuse, rounded, as long as the eye, the 

 upper jaw overlapping the lower. Cleft of the mouth rather oblique, the maxillary 

 extending to the vertical from the centre of the eye. Barbel shorter than the eye. 

 No teeth on the vomer. Nostrils immediately before the eye. Operculum rounded, 

 without point. Branchiostegals five, the second with a process anteriorly at its root, 

 directed downwards. Dorsal filament as long as the eye. Vertical fins continuous, of 

 uniform height, and enveloped in a membrane on to which the epidermoid productions 

 extend ; the dorsal filament is just above the root of the pectoral, immediately before the 

 commencement of the fin. Pectoral rounded, longer than the postorbital portion of the 

 head. Ventral fins narrow, composed of five rays, the two outer ones much the thickest, 

 and produced into filaments, the second ray being the longest, and about two-thirds the 

 length of the head. The distance of the vent from the head exceeds the length of the 

 latter. Eeddish, finely marbled with brown ; fins of a lighter colour and with a trans- 

 parent margin. Length of specimen, 3^ and 6 inches. 



Lepidopsetta, n. gen. (Pleuronectidse). 



Mouth rather narrow ; jaws and dentition very feeble, but nearly equally developed 

 on both sides. Eyes well developed, on the left side, the lower somewhat in advance of 

 the upper. The dorsal fin commences in front of the eye. Pectorals none, or quite rudi- 

 mentary. Lateral line single, straight. Scales very small. The entire head, and even 

 the eyelids, are covered with minute scales. 



LepidoiJsetta maculata, n. sp. (PI. XXX. fig. C). 



D. 118, A. 98. The height of the body is contained twice and one-sixth in the total 

 length (without caudal), the length of the head thrice and two-thirds. The eyes are 

 large, one-third of the length of the head. The feeble maxiUary extends to below 

 the front margin of the eye. Teeth minute, apparently in a single series. Scales 

 strongly ctenoid on both sides of the body. All the fin-rays are scaly. Dorsal and anal 

 fins low. Pectoral entirely absent on the blind side, and represented by a small rudi- 



'itu. 



