DISCUSSION OF SPECIES AND THEIR DISTRIBUTIOiN-. 85 



fin midway between extremity of snout and adipose fln, and above base of outer ventral 

 rays; its last ray behind vertical from middle of anal. A series of from six to nine small 

 spines bent backwards, above and below, before the root of caudal. Pectoral (ins shorter 

 than ventral, and not extending beyond its root. 



Mediolaterals, 2; posterolaterals, 1; precaudals, 2 + 1, the last at the end of the dorsal 

 line. The single posterolateral in advance of the soft dorsal. Number of superanals 7-|-4 ( ?). 



Radial formula; D. 30; A. 18; V. 8; L. lat., ;5(J-;?S. 



This species, of which a single type in bad condition, (i;\ inches in length, is preserved 

 in the British Museum, has hitherto been recorded only from Madeira. A single specimen 

 (Xo. 43708, U. S. N. M.), eighty millimeters in length, was taken by the steamer Albatross 

 from station 2509, in 3!lo 20' N. lat., 08° 03' 30" W. Ion., at a depth of 1,782 fathoms. 



The western Atlantic specimen has 111 rays in the anal and 38 scales iu the lateral line. 



LAMPADENA, Goode and Bean, n. g. 



Myctophid fishes with elongate form of BenthoscmK, having dorsal and anal fins nearly 

 equal and not touching the same vertical. No luminous glands upon the head, but one 

 upon the caudal peduncle above and another in similar position below. Head somewhat 

 conical. Snout short, obtusely conical, the upper and lower profiles nearly etpial; cleft of 

 mouth and limb of opercubiin slightly oblique; lower jaw prominent, maxillary reaching to 

 the angle of preoperculum, and terminating in a triangular dilation. Precaudals two groui)s, 

 the last by itself at the termination of the lateral line. Pectoral not reaching to vertical 

 from origin of ventral or anterolateral photophore. Tubes of lateral line luminous. 



LAMPADENA SPECULIGERA, Goor>E and Bean, n. 8. (Figure 99.) 



Height of body 4i in total length; length of head 4. Least depth of tail three-fifths 

 height of body. Greatest deptli of head about three-fourths of its length. Eye very large 

 its diameter about one-third length of head. Distance between posterior margin of orbit 

 and preoperculum edge about one-half diameter of eye. Snout short, conical, its length, 

 about one-third diameter of eye. Cleft of mouth somewhat oblique, the lower jaw included. 

 Posterior tip of maxillary distant from angle of preoperculum a space almost eijual to length 

 of snout. Origin of dorsal nearer tip of snout than root of caudal by a distance equal to 

 two-thirds the length of its own base, and inserted nearly over root of ventral, over elev- 

 enth scale of lateral line, its last ray over vent, in advance of origin of anal. Pectoral does 

 not reach nearly to vertical from origin of ventral, its length being equal to one-half that of 

 upper jaw, and a little greater than diameter of eye. The ventral does not reach to vent, 

 and its length is equal to about one-half that of head. Scales smooth; those of the lateral 

 line not larger than the others, the tubes passing through them luminous. Eight scales 

 between the adipose fin and the margin of the pearl-colored dorsal patch; there are 3.5 scales 

 in the latei'al line, 4 above and 't below it. The luminous spot, two-thirds as long as the 

 diameter of the eye, club-shaped, on the top of the tail immediately in front of the base of 

 the caudal ray. A similar spot on the lower edge of the caudal peduncle, a little in advance 

 of the origin of the caudal rays, its posterior edge about in line with the center of the dorsal 

 patch; its length about three-fourths the diameter of the eye. 



A luminous gland above and below on the caudal peduncle; no postanal series of super- 

 anal photophores, these being replaced by the subpeduncular glands. Anterolateral, 1; 

 posterolaterals, 2 ; precaudals in two groups, the anterior and lower one of two i)hotopliores, 

 widely separated from the posterior and single one, which is placed at the end of the lat- 

 eral line. The single posterolateral is under the root of the soft dorsal, and considerably 

 behind the termination of the anal. Gill rakers above and 13 or 14 below the angle, the 

 longest about one-half as long as the diameter of the eye. 



Radial formula: 1). 13; A. 14; V. 8; P. very small; Scales 4 | 3!) | '>. 



Color, purplish brown ; very glossy, almost iridescent. 



