160 



DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



Jaw: 



Meter. 



Meter. 

 Anal: 



From snout : . 175 



Longest ray 015 



Pectoral : 



Distance from branchial aperture 002 



Distance from auu.s 04 



Distance from snout 115 



Length 0035 



Width (at base) 0015 



Upper, length 103 



Lower, length 103 



Suspensorium, length 102 



Branchial aperture : 



From snout 11 



From dorsal 028 



Interbrauchial isthmus, width 0035 



Dorsal : 



From snout 07 



Longest ray 0075 



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

 station 2047, in 40° 2' 30" N. lat., 08o 49' 40" W. Ion., at a deptli of 389 tathom.s; Cat. No. 

 33295, U. S. N. M., from station 2043, in 39° 49' N. lat., 08° 28' 30" W. Ion., at a depth of 

 1,467 fathom.s; Cat. No. 3338G, U. S. N. M., from station 2074, in 41° 43' N. lat, 05° 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 991 fatlioms; 

 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 2096, 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 390 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 Saecopharyngina by Alcock. 

 (Apparently true Apodes.) 

 DYSOMMA, Alcock. 

 Dysomma, Alcock, Ann. & Mag. Nat. Hist., 1889 (Nov.), 459; 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 

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

 put. Pectorals well developed. (Alrocl:) 



A single species, Dysomma bueephahis, Alcock, represented by one specimen, 8^ inches 

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

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



DYSOMMOPSIS, Alcock. 

 Bysommopsis, Alcock, Ann. & Mag. Nat. Hist. (6th ser.), viii, 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 tlie lower jaw, and 

 in a double row in the upper jaw; a short row of enlarged teeth in the vomer. Eoni- gills: 

 gill clefts wide; gill-openings small, situated close together near mid-abdominal line. 

 Heart between the gills. Skin scaleless. Vertical iins confluent, the dorsal beginning a 

 short distance behind the gill-opening. No pectorals. (AlcocJc.) 



The genus is represented by T>. miiciimnis, Alcock, obtained by the Investigator in the 

 Indian Ocean, station 120, in 240 to 270 fathoms. 



