2518 DuUctin //, United States National Museum. 



equal in length, though the tip of the tail is slightly rounded, about equal 

 to height of body midway between branchial opening and base of tail ; 

 ventrals inserted almost under middle of operculum, in length about 

 equal to \ length of head; pectorals inserted under origin of dorsal, and 

 at a distance behind branchial opening equal to | vertical diameter of 

 eye, its length equal to greatest height of X\w body. Color grayish 

 brown; abdominal region black. (Goode & Bean.) Gulf stream, north 

 of the Bermudas, in 647 to 1,395 fathoms. {Manati, like the manatee or 

 sea cow.) 



Barthrodenms manatinus, Goode & Bean, Bull. Mus. Comp. Zool., x, No. 5, 200, 1883, 

 Lat. 33° 35' 20" N., Long. 76° W., in 647 fathoms (Type in M. C. Z. Coll. Blake); 

 Jordan, Cat., 127, 1885 ; Gunther, Challenger Report, xxn, 100, 1887 ; Goode & Bean, 

 Oceanic Ichthyology, 332, fig. 294, 1896. 



967. NEMATONUS, Giiuther. 



Ncmatomis, GUnther, Challenger Report, xxn, 114, 1887 (pectoralis) . 



Body compressed, with long tapering tail. Bones of head soft, mucif- 

 erous channels moderately developed, and with the integument very thin 

 or absent on the upper portion and snout. Operculum cartilaginous and 

 flat; a broad process near its upper angle corresponding to the opercular 

 spine in some of the related genera, the head otherwise unarmed, though 

 irreo-ular by reason of the cranial bones. Snout much depressed, broad, 

 rounded; jaws equal in front; mouth very wide; bands of villiform teeth 

 in jaws, on vomer and palatines. Barbel none. Eyes small. Vertical 

 fins confluent; ventrals a pair of bifid filaments close together, on the 

 isthmus, close to the humeral symphysis. Gills 4, with very short laminai 

 and rather short, incurved, acicular gill rakers on the first arch, and much 

 shorter, less numerous, spatulate ones on the 3 other arches. Pseudobran- 

 chi;e rudimentary. No traces of a lateral line, thougli the body is covered 

 with scales of considerable size, almost as large as the eye, and the cheek 

 with others still larger. Xematomts difiers from Poro<jadus not only in the 

 absence of spines upon the head, as Giiuther has indicated, but in the 

 much less ossified opercular apparatus, in the shorter and thicker head, 

 in the absence of the 3 series of pores simulating lateral lines, and in the 

 tendency to prolongation in the lower rays of the pectoral, which increase 

 from the uppermost to the lowermost in Nematonus, while Forogadus has 

 a lanceolate fin, and also in the extreme exsertion of the caudal rays. 

 (vi}jiia, thread; Onus, the rockling.) 



2890. NEMATONDS PECTORALIS, Goode & Bean. 



D. 93 ; A. 73 ; P. 17 ; V. 2. Body moderately elongate, much compressed, 

 the tail much shorter and more robust than in Basso-ctus catena, its height 

 equaling li times length of head and | that of body. Head stoutish, 

 not much compressed, lower than body, its length contained 5\ times in 

 the body; snout compressed, broad at its tip, its length exceeding diame- 

 ter of the circular eye; interorbital area slightly convex, its width 

 slightly exceeding twice diameter of eye, 3 times iu head. Maxillary 



