Jordan and Evermann. Fishes of North America. 2523 



Mexico, and Gulf Stream in various localities, and off coast of Soudan and 

 011 the bank d'Arguin, in deep water, (intro, within; nigcr, black.) 

 Dicrolene intronigra, GOODE &. BEAN, Bull. Mus. Comp. Zool., x, No. 5, 202, 1883, Gulf 

 Stream, Lat. 39 59' 45" N., Long. 68 54' W. (Coll. Blake); GUNTHER, Challenger' 

 Report, xxn, 107, 1887; VAILLANT, Exp. Sci. Travailleur et Talisman, 258, pi. 23, fig. 

 2, 1888; GOODE & BEAN, Oceanic Ichthyology, 338, fig. 297 A and B, 1896. 



971. MIXONUS, Giinther. 



Mixonus, GUNTHER, Challenger Report, xxn, 108, 1887 (laticeps). 



Lower pectoral rays free, not united by membrane with, but inserted 

 on the same base as, the upper part of the fin ; they are but slightly 

 stronger than the other rays and prolonged. Body elongate, compressed, 

 covered with small, very thin and deciduous scales. Head slightly 

 compressed, broad and flat above, depressed in front, naked (with the 

 exception of the parts between the mandibles, and, perhaps, of the 

 cheeks). Bones thin, with nmciferous system moderately developed; only 

 1 small spine above on the operculum; preoperculum without spine. Eye 

 small. Vertical fins united, but the narrow caudal projecting beyond the 

 short dorsal and anal rays. Ventrals each reduced to a filament, which 

 consists of 2 rays firmly bound together in their whole length ; they are 

 inserted behind the humeral symphysis and close together. Snout broad, 

 rounded, scarcely overlapping the lower jaw. Mouth very wide ; villiforrn 

 teeth in the jaws, on the vomer, and palatine bones. Gill laminae short; 

 gill rakers long, not very closely set. Pseudobranchiae none. (//zz, 

 mixture, half; Onus, a synonym of Gaidropsarus, the rockling.) 



2894. MIXONUS LATICEPS (Giinther). 



Head 2; depth 3; eye 8 in head; snout 4. P. 17. Greatest depth of body 

 below origin of dorsal fin; distance of vent from snout its distance from 

 extremity of spinal column. Crown of head remarkably convex, covered 

 with an extremely thin and transparent skin, which, perhaps, in older 

 examples is scaly; interorbital space less convex, and equaling in width the 

 length of snout including the eye ; eye small, above middle of length of the 

 maxillary; posterior nostrils wide, open, in front of the eye. Distance of 

 vent from ventrals exceeds length of head; origin of dorsal fin above 

 root of pectorals, its rays of moderate length, but longer than those of 

 anal; pectoral with a rather narrow base, as long as head without snout, 

 its rays feeble, 3 or 4 lower ones a little stouter, detached, and prolonged; 

 ventral filaments not reaching as far backward as pectoral. Gill rakers 

 10, much longer than the laminte. Whitish, with the abdomen and gill 

 apparatus black. Mid-Atlantic, in profound depths. One specimen, 5 

 inches long, was obtained in mid- Atlantic (Challenger Station 104), at the 

 enormous depth of 2,500 fathoms. The second (type of Sirembo guntheri) 

 was taken off Cape Verde, in 3,200 meters, (laius, broad; -ceps, head.) 

 Bathynectes laticeps, GUNTHER, Ann. Mag. Nat. Hist. 1878, 20, mid-Atlantic, in 2,500 fath- 

 oms. (Coll. Challenger.) 

 Sirembo yuntheri, VAII.LANT, Exp. Sci. Trav. et Talisman, 268, pi. xxiv, fig. 5, 1889, off the 



Cape Verde Islands, at a depth of 3,200 meters. 



Mixonus laticeps, GUNTHER, Challenger Report, xxn, 108, pi. 25, fig. 8, 1887 ; GOODE & BEAN, 

 Oceanic Ichthyology, 339, fig. 296 A, 1896. 



