406 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



Station 2103, in 38° 47' 20" X. lat., 72° 37' W. Ion., at a depth of 1,091 fathoms; from station 

 2102, in 38-3 -41" N. hit., 720 38' AV. h)n., at a depth of 1,200 fathoms; from station 2110, in 35° 

 45' 23" N. hit., 740 31' 25" W. Ion., at a dcptli of 88S fatlioms; from station 2520, in 41o 03' 

 30" N. hit., 06° 14' W. Ion., at a depth of 0<i2 fatlioms; and from station 2115, iu 35° 49' 30" 

 N. hit., 740 34' 45" AV. Ion., at a depth of 843 fathoms. 



HYMENOCEPHALUS, GiglioH. 



Hymenocephalus, Giglioli, Pelagos, Genoa, 1884, 228 (type, //. italicus, with recognizable figure.)— A'aii.lant, 



Exp. Sci. Travailleur et Talisman, 210. 

 Mystaconurus (as subgenus), Gunther, Challenger Report, xxii, 1887, 121. 



Allied to CorypJurnoidcs, with smooth dorsal spine, -with first dorsal broad, i)laced 

 far forward over base of pectoral; with second dorsal and anal origins nearly opposite, and 

 separated by a considerable space from the vertical from the end of first dorsal ; with vent 

 ftir from ventral origin. Head large, naked, soft, and cavernons; snout abrupt, jieipendic- 

 nlar or parabolic; mouth lateral, wide. Eye very large, orbital margin forming j)art of 

 profile of head. Barbel long. Pectoral rather narrow (10-16 rays). Scales thin, decidu- 

 ous, with fine short spines. Under parts in advance of ventral wholly or i)artly naked. 



Hymcnocei^hulus hctcrolepis (Alcock), occurs in the Andaman Sea, off Koss Island, in 

 205 to 271 fathoms, and iu the Bay of Bengal, between Watts and South Sentinel Islands in 

 220 to 240 fathoms (Ann. and Mag. Nat. Hist. 1889, Nov., 39G.), and in the Laccadive Sea, 

 188-220 fathoms. [111. Zoiil. Investigator, I, pi. Ill, fig. 30.] 



H. longiharhis (Giinther), was taken by the Challenger at Station 173. ort' Matuku, Fiji 

 Islands, at the depth of 315 fathoms. 



HYMENOCEPHALUS ITALICUS, Giglioli. 



Malarocrplialiis Imns, Morrau (not Lowe), Hist. Nat. Poiss. France, 1881, iii, 284, fig. 183. 



Hymeiwcephalus ildlicun, Gir,i.ioiA,Pi'>\agos, 228, 1884 (without description, but with fair woodcut). — Vail- 



LANT, Exp. Scient. Travailleur et Talisman, 127, pi. xix, fig. 1. 

 Macruiun (Mjislaconurus) ilalicii.i, GCnthkr, Challenger Report, xxii, 1887, 141. 



Head deeper than broad, with vertical sides and wide muciferous cavities; snout 

 obtuse, short, slightly projecting beyond the mouth, the cleft of which is oblique, anterior 

 and lateral, and extending to behind the middle of the eye. Teeth in both jaws minute, 

 of equal size, villiform, in narrow bands. Barbel small. Interorbital space as wide as the 

 eye, the diameter of which is one-third of the length of the head, and exceeding the snout 

 in length. Scales extremely thin, deciduous, spiny, of comparatively large size. Preoper- 

 cular margin not serrated. Anterior dorsal spine smooth, filamentous; the distance 

 between the two dorsal fins is Init little more than the length of the base of the former. 

 Pectoral fin about half as long as the head. Vent far behind first dorsal but close to the 

 root of the ventral fins which reach it, and the outer ray of which is produced into a fila- 

 ment. Anal far back. A triangular scaleless space between the ventral fins, nearly 

 extending to the vent; a small round naked space, surrounded by sjjiuy scales, in the 

 middle of the preveutral region. Distance between the vent and the isthmus three-fourths 

 of the length of the head. Body and tail colorless; sides of thi^ head and abdomen sil- 

 very; lower parts to the vent black. (Giinther.) 



Eadial formula: D. 12; P. 10; V. 10. 



Giinthei', who examined a young specimen from Nice, 5i inches long, says tliat there 

 can be no doubt that this is a juvenile form, and that if it were not for the dentitio)i he 

 should not hesitate to refer it to Macrurm lewis, with which it agrees in several important 

 characters. Moreau and Yaillant had no opportunity to examine larger specimens. The 

 French expedition obtained 118 specimens at depths of 205 and 1,042 fathoms oif the coast 

 of Morocco. 



