Indian Deep-sea Dvedjiiuj. 137 



Dysomma, Alcock. 



49. Dysomma bucephalus^ Alcock. 



Di/somma bucephalus, Alcock, Ann. & Mag. Nat. Hist., Dec. 1889, 

 'p. 459. 



A single specimen from Station 120, 240 to 276 fathoms. 

 It was alive on reaching the surface. 



Fio-. 5. 



Dysomma bucephalus, X |. 



Dysommopsis, gen. nov. 



Allied to Dysomma. 



Tail of great relative length, the vent being close to the 

 gill-opening. Eyes small, deeply subcutaneous. Snout 

 .studded with pores. Nostrils large, lateral. Mouth wide. 

 Small sharp teeth in a single row in the lower and a double 

 row in the upper jaw ; a short row of enlarged teeth in the 

 vomer. Four gills ; gill-clefts wide ; gill-openings small, 

 situated close together near mid-abdominal line. Heart 

 between the gills. Skin scaleless. Vertical fins confluent, 

 the dorsal beginning a short distance behind the gill-opening. 

 No pectorals. 



50. Dysommopsis muciparus^ sp. n. 



Head a little inflated in the bi'anchial region, tapering 

 anteriorly ; its length a little more than one eighth of the 

 total. Body compressed and narrow, its greatest height, 

 immediately behind the gill-opening, about two fifths the 

 length of the head. The vent lies with the genital pore in 

 an unpigmented circular depression, which is situated at a 

 distance from the gill-opening equal to the length of the 

 posti ostral portion of the head ; the tail, which tapers very 

 slightly, is therefore more than four times the combined head 

 and trunk in length. 



Snout acutely pointed, overhanging the upper jaw ; its 

 length is one fifth that of the head and 2^ times that of the 

 small deeply subcutaneous eye ; its surface is densely 

 crowded, like the lips, with minute pores. Nostrils large ; the 



