86 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



An individual (No. 43796, U. S. N. M.), 50 millimeters in length, was taken by the 

 Albatross at station 2553, in 39° 48' N". lat., 70° 36' W. Ion., at a depth of 551 fathoms. 



^ETHOPRORA, Goode and Bean, n. g. 



Body oblong, compressed, resembling in general form Myctophum; covered with large 

 scales, those in the lateral line very slightly larger than the others. Head compressed. 

 Snout very obtuse, and short, projecting slightly beyond orbital margin, the jaws about 

 equal. Eye moderate. Dorsal tin premediau, entirely or almost entirely in advance of the 

 anal, which it closely resembles in shape and dimensions. Ventral with 8 rays inserted 

 under the anterior portion of the dorsal. Pectorals moderate, placed low. Adipose fin long 

 and prominent. A prominent luminous gland of irregular form occupies the front of the 

 head iu advance of eye, encroaching upon the anterior margin of the orbit, and extending 

 beyond it above and below. A luminous spot of greater or less extent upon the body at 

 the angle of the preoperculum and, in some species, others upon the interoperculum and 

 upon the sides of the lower jaw. 



Superanal photophores in two groups; posterolaterals sometimes present, sometimes 

 absent. Precaudal photophores, 4, forming a more or less crescent-shaped line at the base 

 of the lower caudal lobe, a large, irregular gland occupying entire space in front of eye. 



(Etymology: A t>?«?= glow, and zpiopa=a, face). 



KEY TO THE SPECIES OF .ETHOPRORA. 

 I. Scales in lateral line 40. 



A. Antero and mediolaterals and superanal photophores irregularly arranged A. metopoclampa. 



II. Scales in lateral line 35-36. 



A. Anterolaterals 2, mediolaterals 2, posterolaterals none V. lucida. 



B. Anterolateral 1, mediolaterals 3 or 4, posterolaterals 2 A. EFFULGENS. 



^ETHOPRORA METOPOCLAMPA (Coccoi. Goode and Bean. (Figure 101.) 



Nyotophus metopoclampus, Cocco, Giorn. Scien. si.il. Palermo, L82-9, No. 77, 111 (Nittdfofrontelucida); Alcuni 

 Salmon^i, 1838. 21. PI. m, Fig. 8.— Bostaparte, Faun. Hal. Pesc, fasc, xxxvn, 1810. Fig. 



Seopehis metopnelampum, CrjVIER ami VALENCIENNES, Hist. Nat. Poiss, SXII, 112. 



Scopehis metopoolampus, GOstther, Cat. Fish. Brit. Mas., V, 409.— Giglioli, Eleuco, 100.— Raffaele, .Mitt. 

 Zool. Stat., Naples, ix, 183, PI. vn. Fig. 6. 



Height of body contained 4J in total length (without caudal) ; length of head 3i times. 

 Least depth of tail half the height of body. Head slightly longer than high. Eye large, 

 diameter one-third that of head. Profile almost perpendicular, an elaborate luminous plate 

 occupying the entire space between the eyes, extending backward between the lower 

 margin of the orbit and the upper jaw to a point behind the vertical from the middle of the 

 orbit, and also with a lobe on either side above, impinging upon the anterior upper limb of 

 the orbit. Cleft of mouth slightly oblique, its length nearly twice the diameter of the orbit. 

 The maxillary reaches the angle of the preoperculum, and is not dilated behind. The origin 

 of the dorsal and ventral tins is in the same vertical, that of the latter equidistant from the 

 tip of the snout and the adipose tin, that of the former equidistant from the anterior margin 

 of the orbit and adipose tin. The insertion of the last dorsal ray over the origin of the 

 first anal ray. Pectoral two thirds as long as ventral, its tip reaching slightly beyond vertical 

 connecting origin of dorsal and anal. Scales smooth; those of lateral line slightly larger. 



The photophores are small and not very conspicuous. In the example studied, there are 

 11 iu superanal series, there being a broad break over the root of the last anal rays, with 

 5 in front and 6 behind it, the single posterolateral being placed far above, near the lateral 

 line, and forming an equilateral triangle with the two placed on either side of the break. 

 Mediolaterals, 2, placed obliquely and far apart, the anterior and highest above the origin 

 of the anal, the posterior and lower about midway between this and the first in the anal 

 series, which is over the interval between the roots of the third, fourth and fifth branched rays 

 of the anal tin. Anterolaterals, 3, placed in the form of an isosceles triangle, the apex of 



