86 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



All individual (No. 4379(5, U. S. N. M.), 50 millimeters in length, was taken by the 

 Albatross at station 125r)3, in Sd^ -48' N. lat., 70° 36' W. Ion., at a depth of 551 fathoms. 



^THOPKOKA, 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, prqiectiiig slightly beyond orbital margin, the jaws about 

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

 anal, which it closely resembles in shape aud 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 in advance of eye, eacroachiug 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, -1, 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: ^■):''/"?=glow, and nfjwpa=& face). 



KEY TO THE SPECIES OF .ETHOPRORA. 



I. Scales in lateral line 40. 



A. Autero aud meiliolaterals and superanal photoiibores irregularly arranged A. metopoclampa. 



II. Scales in lateral Hue 35-36. 



A. Anterolaterals 2, luediolaterals 2, posterolaterals none A. i.ucida. 



B. Anterolateral 1, mediolateral8 3 or 4, posterolaterals 2 A. ekfulgens. 



^THOPRORA METOPOCLAMPA (Cocco), Goode and Bean. (Figure 101.) 



Nyctoplius metopoclampiis, Cocco, Gioru. Scien. Sicll. Palermo, 182i), No. 77, 141 {Sltlofo fronldniida) ; Alcuni 

 Saliuonidi, 1S38, L'l, PI. iii. Fig. 8.— Bonaparte, Faun. Ital. Peso., fivsc., xxxvii, 1840, Fig. 



ScopeluH iiietoiiDcliinipiim, Ccivier and Valencien.ves, Hist. Nat. Poiss, xxil, 442. 



Scopehis metopoclaiiipiiK, GiiSTiUiR, Cat. Fish. Brit. Mus. , V, 409. — Giglioli, Elenco, 100. — Rakfaele, Mitt. 

 Zoiil. Stat., Naples, IX, 183, PI. vii, Fig. 6. 



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

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

 diameter one-third that of head. Prortle almost perpendicidar, an elaborate luiuinous 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 

 orl)it, 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 fins is in the same vertical, that of the latter equidistant from tiie 

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

 of the orbit aud 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 exanqtle studied, there are 

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



5 in front and behind it, the .single posterolateral being placed far abo\o, near the lateral 

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

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

 of the anal, the posterior and lower about midway between this and the tir.st in the anal 

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

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



