160 



DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



Jaw: 



Upper, length 103 



Lower, length 103 



Suspensorium, length 102 



Branchial aperture : 



From snout 11 



From dorsal 028 



Interbranchial isthmus, width . , 0035 



Dorsal : 



From snout 07 



Longest ray 0075 



Meter. 



Width (at base) 0015 



The following specimens were taken by the Albatross: Cat No. 33294, U. S. N. M., from 

 station 2047, in 40° 2' 30" N. hit., 08° 49' 40" W. Ion., at a depth of 389 fathoms; Cat. No. 

 33295, U. S. N. M., from station 2043, in 39° 49' N. lat., 68° 28' 30" W. Ion., at a depth of 

 1,407 fathoms; Cat, No. 33386, U. S. N. M., from station 2074, in 41° 43' N. lat, 65° 15' 20" 

 W. Ion., at a depth of 1,309 fathoms; Cat. No. 35407, U. S. N. M., from station 2179, in 39° 

 30' 10" N. lat., 71° 50' W. Ion., at a depth of 510 fathoms; Cat. No. 35521, U. S. N. M., 

 from station 2210, in 39° 37' 45" N. lat, 71° 18' 45" W. Ion., at a depth of 99 L fathoms; 

 Cat. No. 35525, U. S. N. M., from station 2211, in 39° 35' N. lat, 71° 18' W. Ion., at a depth 

 of 1,064 fathoms; Cat No. 33545, U. S. N. M., from station 2090, in 39° 22' 20" N. lat, 70° 

 52' 20" W. Ion., at a depth of 1,451 fathoms; Cat. No. 35621, U. S. N. M., from station 2202, 

 in 39° 38' N. lat, 71° 39' 45" W. Ion., at a depth of 515 fathoms; and Cat. No. 35528, U. S. 

 N. M., from station 2206, in 39° 35' N. lat., 71° 24' 30" W. Ion., at a depth of 1,043 fathoms. 



Doubtfully placed in Saceopliaryngina by AlcocJc. 



(Apparently true Apodes.) 

 DYSOMMA, Alcock. 

 Dyaomma, Alcock, Ann. & Mag. Nat. Hist.. 1889 (Nov.), 450; Bathybial Fishes of the Bay of Bengal, 35. 



Soft tissues well developed; osseous tissues weak. Body high anteriorly and the 

 head much inflated. Tail tapering to a point. Vent situated immediately behind the gill 

 opening. Snout short, slightly overhanging the mouth, its surface with many pores. Eyes 

 minute, concealed beneath the skin. Nostrils large, lateral. Cleft of mouth wide. Minute 

 sharp teeth in a single row in each jaw; a row of larger teeth in the vomer. Tongue not 

 free. Four gills, communicating with the pharynx by wide slits. Osseous elements of the 

 gill-cover rudimentary or absent. Gill-openings separate. Heart situated between the 

 gills. No scales. Vertical fins fairly developed, the dorsal beginning just behind the occi- 

 put. Pectorals well developed. (Alcock.) 



A single species, Dysomma bucephalus, Alcock, represented by one specimen, 8f inches 

 long, taken in the Bay of Bengal, in 193 fathoms, hit, 20° 17' 30" N., Ion. 88° 51' E., by the 

 Investigator, and another from station 120, in 240 to 276 fathoms. 



DYSOMMOPSIS, Alcock. 

 Dysommopais, Alcock, Ann. & Mag. Nat. Hist. (6th ser.), vm, 1891, 137. 



A genus allied to Dysomma, having a tail of great relative length, the vent being close 

 to the gill-opening. Eyes small, deeply subcutaneous. Snout studded with pores. Nos- 

 trils large, lateral. Mouth wide. Small sharp teeth in a single row in the lower jaw, and 

 in 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. (Alcock.) 



The genns is represented by />. muciparus, Alcock, obtained by the Investigator in the 

 Indian Ocean, station 120, in 240 to 276 fathoms. 



