DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 1)1 



Liitkeii Lad numerous specimens from the following localities: N. lat. 42^, W. Ion. 12^ 

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

 29°, W. Ion. 34°; N. lat. 28°, W. Ion 3(5°; N. lat. 22° 10', W. Ion. 78°; N. lat. 22^ 12' W. Ion. 

 280 48'; N. lat 20°, W. Ion. 48o_50O; K. lat. 19'3-19o 30', W. Ion. 20° o'-26o 10'; N. lat. 1.5o 

 19', W. Ion. 243 54/. ]Sf. i^t. 140 ny \\\ lou. 28°; S. lat. 4° 20', W. Ion. 14° 20'; S. lat. 8°, 

 W. Ion. 130 20'; S. lat. 24O80', W. Ion. 28^30'; S. lat. 25° 4', W. lou. 270 20'; S. lat. 33=30', 

 W. lou. 11°; S. lat. 5° 21', E. Ion. 81° 56'; S. lat. 15o 35', E. Ion. 109° 20'; S. lat. 10°, E. 

 Ion. 110° 20'; S. lat. 23° 40', B. Ion. 57° 40'; S. lat. 23° 30', E. Ion. 8IO; S. lat. 24= 30', E. 

 Ion. 750 50'; S. lat. 27° 40' E. Ion 58° 30'; S. lat. 28° ]6'-;30o. E. Ion. 97° 30'-96O; S. lat. 29<:' 

 54', E. Ion. 70° 42'; S. lat. 32° 15', E. lou. .58o 30'; S. lat.'380; and since examining liis 

 paper, we find them uot uuconimoii in the collection of tlie National Museum, niingkd with 

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

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

 found to be a sexual variation of S. Cucvoi. 



RHINOSCOPELrS KAKUS, LiiiKKX. 

 Scopclus {Ehhwscojieltts) rurus, r,UTKEN, Spolia Athiuticii, 11, 1S!I2, l!l(), lig. 4. 



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

 many important particulars, and but for the unquestioned accui-acy aud thorough insight 

 which this authority has always maiufested, au inspection of tlie tigure would lead us to 

 question whether it properly belongs here. The i)eculiar arrangement of the photophores, aud 

 the xjresenee of a luminous plate u^ion 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, aud the comparative 

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

 I)reopercular limb. The most characteristic feature in the arrangement of the photoidiores 

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

 superanal series, comparatively much smaller than in »S'. Coccoi. 



ELECTRONA, Goode and Bean, n. g. 



Myctophids having dorsal aud 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 ])as(sing behind th(^ vertical from soft dorsal. 

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

 cle short and stout. No posterolateral photophore. (Type, Scopelm Bissoi, Cocco.) 



ELECTRONA RISSOI (Cocco), Goode aud Beax. (Figure 107.) 

 Scopeliis rissoi, Cocco, Giorn, ,Sicil.,fasc. 77.144 ; Lett, su S.almon.,15, 1'1.2, fig.5.— Cuvikk .aud Valenciennes, 

 Hist. Nat. Poiss., xxii, 44(5. — Gi N[I1ei:, Cat. Fisli. Biit. Mas., v, 405. 



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

 a good figure of a si>ecimen sent to the National Museum by the Royal Museum in Florence. 

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

 near Rhinoscopelus on account of the resemblance in the scales, 



DASYSCOPELUS, Gunther. 



Dasi/si-ope.his, Gi-NTHER, Cat. Fish. Brit. JIus. v., 1864, 40.5, 4LL. 



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

 overlapping; somewhat eumrgiuatc. Scales of lateral line much eularged, hard, i>ersisteiif, 

 ctenoid. Anal ternnnating below soft dorsal. Body elevated, somewhat compressed. Caiulal 

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

 ment of the photophores much as in jMyctopJuim : 2 anterolaterals; 2 tuediolatcrals: one pos- 

 terolateral, far iu advance of the break iu the anal series, 2 precaudals, the last at the eiul 



of the lateral line. 



The type of this genus is ,^copeb(s aspcr and Giinther assigns to it also S. subaspcr, from 

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



