DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 91 



Liitkea had numerous specimens from the following localities: N. lat. 42°, W. Ion. 12° 

 54'; N. lat. 35° 22'-36o 22', W. Ion. n^ 37'-48o 48'; JST. lat. 29° 31', W. Ion. 34° 33'; jST. lat. 

 290, W. Ion. 34°; H. lat. 28°, W. Ion 36°; N. lat. 22° 16', W. Ion. 78°; N. lat. 22° 12' W. Ion. 

 28° 48'; N. lat 20°, W. Ion. 480-50°; N. lat. 190-19° 30', W. Ion. 26° 5'-26° 10'; K lat. 15° 

 19', W. Ion. 24° 54'; N. lat. 14° 46' W. Ion. 28°; S. lat. 4° 20', W. Ion. 14° 20'; S. lat. 8°, 

 W. Ion. 130 20'; S. lat. 24° SO', W. Ion. 28=30'; S. lat. 25o 4', W. lou. 27o26'; S. lat. 33° 30', 

 W. Ion. 11°; S. lat. 5o 21', E. Ion. 81° 56'; S. lat. 15° 35', E. Ion. 109° 20'; S. lat. 16o, E. 

 Ion. 110° 20'; IS. lat. 23o 40', E. Ion. 57° 40'; S. lat. 23o 30', E. Ion. 81°; S. lat. 24° 30', E. 

 Ion. 750 50'; S. lat. 27° 40' E. Ion 58° 30'; S. lat. 28° 16'-30o, E. Ion. 970 30'-90O; S. lat. 29<; 

 54', E. Ion. 760 42'; S. lat. 32° 15', E. Ion. 58° 30'; S. lat.' 38°; and since examining bis 

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

 the specimens identified by us with is. 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 S. Coccoi. 



KHINOSCOFELUS RARUS, LtVrKKN. 

 Scopelua (Bhino8coj)eli(s) rurim, L.i)TKEN, Si)olia Atlantica, 11, 1892, 246, lig. 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 arrangemeiitof the photophores, and 

 the presence of a luminous plate upon the top of the caudal i)eduncle 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 

 superaual series, comparatively much smaller than in H. Coccoi. 



ELECTRONA, Goode and Bean, n. g. 



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

 much enlarged; scales bard, persistent. Luminous gland on toi) of the caudal iieduncle, 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. (Tyj)e, Scopclus Eissol, Cocco.) 



ELECTRONA RISSOI (Cocco), Goode ami Bkan. (Figure 107.) 

 Scopeliis ?-issoi, Cocco, Giorn, SiciL.fasc. 77,144; Lett, sii Salmon., 15, PI. 2, lig. 5. — Cuvier aud Valenciennes, 

 Hist. Nat. Poiss., xxii, 446. — GCnthei:, Cat. Fish. Brit. Mus., v, 40.5. 



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

 a good figure of a »i)ecimen sent to the National Museum by the Koyal Museum in Florence. 



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

 near Rhinoscopelus on account of the resemblance in the scales. 



DASYSCOPELUS, Giinther. 



Dasi/scopeUis, GiJNTHER, Cat. Fish. Brit. Mus. v., 1864, 40.5, 4LL. 



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

 overlajiping; somewhat emarginat<'. Sc-alcs of lateral line much enlarged, liard, persistent, 

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

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

 ment of the photophores much as in Myctophum : 2 anterolaterals; 2 mediolaterals; one pos- 

 terolateral, far in advance of the break in the anal series, 2 precaudals, the last at the end 

 of the lateral line. 



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

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



