DISCUSSION OF SPECIES AND THEIR DISTKIBUTION. 85 



fill midway between extremity of snont and adipose fin, and above base of outer ventral 

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

 spines bent backwards, above and below, before the root of caudal. Tectoral fins shorter 

 than ventral, and not extending beyond its root. 



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

 line. The single posterolateral in advanceof the soft dorsal. Nmnber of superanals T-f-A ( ?). 



Radial formula; D. 3(i; A. IS; V. 8; L. lat., 3fj-;5S. 



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

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

 (No. 43708, U. S. N. M.), eighty millimeters in length, was taken by the steamer Albaiross 

 from station 2509, in 39o 26' N. lat., 68° 03' 30" W. Ion., at a depth of 1,782 fathoms. 



The western Atlantic specimen has 19 rays in the anal and 38 scales in the lateral line. 



LAMPADENA, Goode and Bean, n. g. 



Myctophid fishes with elongate form of Benthosema, 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. Uead somewhat 

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

 mouth and limb of openiulum slightly oblique; lowcn- jaw i)rominent, maxillary reaching to 

 the angle of pi-eoperculum, and terminating in a triangular dilation. Precandals two groups, 

 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, Goode and Bean, n. s. (Figure 09.) 



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

 height of body. Greatest depth 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. Oleft of mouth somewhat oblique, the lower jaw included. 

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

 of snout. Origin of dorsal nearer tip of snout than root of caudal by a distaiu/e 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 35 scales 

 in the lateral line, 4 above and 5 below it. The luminous spot, two thirds as long as the 

 diameter of the eye,-club-shaped, ou the top of the tail iminediately 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 origiu of the caudal rays, its posterior edge about in Hue with the center of the dorsal 

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



A luminous gland above and below on thecaud;il i)edunclc; no postanal series of super- 

 anal pliotophores, these being rcplactid by the subi)e(luncular glands. Anterolateral, 1; 

 ])osterolaterals, 2; precandals in two groups, the anterior and lower, one of two pliotophores, 

 widely sc^piirated from tin; posterior and single one, which is plared at tlie 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 6 above and 13 or 14 hclow the angle, the 

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



liadial formula: I). 13; A. 14; V. 8; P. very small; Scales 4 | 39 | 5. 



Color, purplish brown ; very glossy, almost iridescent. 



