324 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



The mnciferous channel upon the iiifriiorhital ring shows in its course several wide sub- 

 circular siuiises, closely approximated; a similar row upon the posterior edge of the i)re- 

 oi)erculum aud continued forward ui)oii the under surface of the mandible; the vertex also 

 has a semicircle of siniihir sinuses. To the chain-like appearance of these rows of ducts 

 the specilic name lias reference. (The appearance of a spine over the eye, as shown in the 

 drawing, is due simply to the shrinking of the porous adjacent regions.) 



The maxilla extends beyond the vertical through the posterior margin of orbit, its 

 length e(iual to that of postorbital part of head. Mandible two thirds as long as head and 

 equal in length to height of body. Jaws, vomer, aud i)alate with bands of villiform teeth; 

 the vomerine band V-shaped. 



Nostrils in front of the middle of the eye, separated by a slight interspace, the anterior 

 nearer to its mate than to the tip of the snout. 



Branch iostegals 8. Pseudobrauchiic absent. 



Gill-rakers long aud numerous, the longest slightly exceeding in length the diameter of 

 eye; 15 developed below the angle of the first arch, besides several rudiments. 



The dorsal origin is slightly behind that of the pectoral, its distance from the tip of 

 the snout (32 millimeters) about 7J in total; rays well developed; in the anterior thud of 

 the fin, in a space equal to the length of the head, were counted 20 rays, the longest of 

 which is two-fifths as long as the head. 



The anal origin is under the twenty-first dorsal ray; its rays are shorter than those of 

 the dorsal. The pectoral extends to the vertical from the eighteenth ray of the dorsal. It 

 is four-fifths as long as the head. 



The ventrals are composed each of a simple filament, the origin slightly in advance of 

 the vertical through the pectoral origin, the length two thirds that of the head. They do 

 not reach near to the vent, the distance of which from the origiu of the ventrals (30 milli- 

 meters) is slightly greater than the length of the head. 



Color, brownish yellow. Head and abdomen blackish. 



The types (Xo. 37341) are from Albatross station 2379, N. lat. 28° 00' 15", W. Ion. 

 87° 42', 1,467 fathoms. The length of the longest is 237 millimeters, of the other 227 milli- 

 meters. 



GLYPTOPHIDIUM, Alcock. 



OlyptopUdium, AlcOCK, Ann. and Mag. Nat Hist., 1889, 390; Bathybial Fishes of the Bay of Bengal, 17. 



Head large, body compressed, with a long, tapering tail. Scales deciduous and very 

 thin. Bones of head soft and cavernous, with prominent outstanding crests. Operculum 

 small, with one feeble spine. Snout obtuse. Jaws equal in front. Month wide. Villiform 

 teeth in narrow bands in the jaws, palatines, and vomer. No barbel. Eyes large. Caudal 

 fi'ee. Ventrals simple filaments. Gills four, with short lamiuai. Brauchiostegals eight. 

 Pseudobrauchiic. Pyloric appendages small. 



The genns, which is separated from Bassozctus chiefly by the crests on the head ("in 

 81)irit, frill like, membranous, longitudinal"), is known from a single specimen of the species 

 G. argenteum, taken by the Investigator in the Andaman Sea, off Eoss Island, in 271 fath- 

 oms. (Alcock, loc. cit.) 



DERMATORUS, Alcock. 

 Dennatorus, Alcock, Ann. and Mag. Nat. Hi.st. (Gth scr.), vi, 1890 (Oct.), 298. 



Body compressed, with long, tapering tail. Ilead with well-developed mnciferous cavi- 

 ties and numerous spiniferous bones. Snout compressed, with jaws coterminous in front. 

 Eye of moderate size. Mouth very wide; villiform teeth in bands on the jaws and pala- 

 tines, and few and scattered on the vomer. Gill-openings very wide. Brauchiostegals, 8. 

 Gills, 4. Gill-rakers well developed. Pseudobranchiie quite rudimentary. Scales small, 

 deciduous; lateral line undistinguishable. Ventral fins contiguous, each of a single sim- 

 ple filament. No pyloric cseca. No barbel. {Alcock.) 



