DISCUSSION OF SPECIES AND THEIB DISTRIBUTION. Ill 



Liitken had numerous specimens from the following localities: N. lat. 42", W.lon. L2 

 54'; N. lat.35 22'-36 22', W. Ion. 41 37'-48 18'; N. lat. 29 31', W. Ion. 34° 33'; N. lat. 



29°, W. Ion. 34^; v. lat. 28°, \Y. Ion 36°; N. hit. 22° 16', W. Ion. 78 ; N. lat. 22° 12' W. Ion. 

 28< is' : X. Lit I'D , W. Ion. 4S°-50°; N. hit. 19°-19° 30', W. Ion. 26= 5'-26° 10'; X. lat. L5 

 lit', W. Ion. 24o 54'; N. hit. 14" 4(1' W. Ion. 28°; 8. Int. I 20 . W. Ion. 1 I 20 ; S. hit. 8°, 

 W. Ion. 13° 20'; S. lat. 24 SO', W. Ion. 28 30'; S. lat. 25 4'. W. Ion. 27< 26'; S. lat. 33° 30', 

 W. Ion. 11°; S. hit. 5 21', E. Ion. 81 56 ; S. lat. l.v 35 . B. Ion. 109° 20'; S. lat. 16 , B. 

 Ion. 110 20'; S. lat. 23 be, E. Ion. -".7 M) ; S. lat. 23< 30', E. Ion. 81°; S. lat. 24° 30', E. 

 Ion. Too 50'; 8. lat. 27 40' B. Ion 58^ 30'; S. lat. 28oi6'-30°. E. Ion. 97° 30'-9G°; S. hit. 29 

 54', E. Ion. 76^42'; S. hit. 31'- 15', E. Ion. 58° 30'; S. lat. 38 ; and since examining his 

 paper, we find them not uncommon in the collection of the National Museum, mingled with 

 the specimens identified by us with 8. Coccoi. It occurs in almost every lot, and therefore 

 a new list of localities is not given. It seems not impossible the form may eventually be 

 found to be a sexual variation of 8. Coccoi. 



RHLNOSCOPELUS RARUS, Lutken. 

 Scopelua (BtAnoaeopeliu) rarus, i>i tm:n, Spolia Atlantica, 11, 1892, 246, fig. 4. 



This species, described by Liitken, seems to differ from the other species of this genus in 

 many important particulars, and but for the unquestioned accuracy and thorough insight 

 which this authority has always manifested, an inspection of the figure would lead us to 

 question whether it properly belongs here. The peculiar arrangement of thephotophores, and 

 the presence of a luminous plate upou the top of the caudal peduncle distinguish it at once 

 from all the others, as well as does the shape of the body, which is more like that of Myc- 

 tophum, the short anal fin, the overlap of the dorsal with the anal, and the comparative 

 shortness and thickness of the caudal peduncle, and also the nearly vertical direction of the 

 preopercular limb. The most characteristic feature in the arrangement of the photophores 

 is the almost entire absence of the postventral series and the number of photophores in the 

 Buperanal series, comparatively much smaller than in 8. Coccoi. 



ELECTRONA, Goocle and Bean, n. g. 



Myctophids having dorsal and anal fins slightly overlapping. The lateral line with scales 

 much enlarged; scales hard, persistent. Luminous gland on top of the caudal peduncle, but 

 none on head. Anal longer than dorsal, and passing behind the vertical from soft dorsal. 

 Body ovate, compressed; head short; profile declivous; snout not projecting. Caudal pedun- 

 cle short and stout. No posterolateral photophore. (Type, Scopelus Ris.soi, Cocco.) 



ELECTRONA RISSOI (Cocco), Goode and Bean. (Figure 107.) 



Scopelus n'svi. (' < . i"in. Si oil., fase. 77,144 ; Lett, sn Salmon., 15, PI. 2, fig. 5. — Cuyiek and VALENCIENNES, 



Hist. Nat. Poiss., xxn, 446. — GOnther, Cat. Fish. Brit. Mns., v, 405. 



No description is necessary of this well known species, but for the first time is presented 

 a good figure of a specimen sent to the National Museum by the Royal Museum in Florence. 



We are greatly in doubt as to the relationships of this form, but it is provisionally placed 

 near RhinoscojH Iks on account of the resemblance in the scales. 



DASYSCOPELUS, Gunther. 



Dasi/scopelus, GOnther, Cat. Fish. Brit. Mus. v., 1864, 105, ILL. 



Myctophid fishes, having the dorsal and anal fins touching the same vertical, but not 

 overlapping; somewhat emarginate. Scales of lateral line much enlarged, hard, persistent, 

 ctenoid. Anal terminating below soft dorsal. Body elevated, somewhat compressed. Caudal 

 peduncle rather slender; luminous scales on the back of the caudal peduncle. The arrange 

 ment of the photophores much as in Myctophum : 2 anterolaterals; 2 tnediolaterals; • pos- 

 terolateral, far in advauce of the break in the anal series, 1' precaudals, the last at the end 

 of the lateral line. 



The type of this genus is Scopelus asper and Gunther assigns to it also s. subasper, from 

 the Pacific. (For I), spinosus, Steindachner, see Appendix). 



