568 Bulletin 47, United States National Museum. 



of eye ; pectoral small, reaching front of dorsal ; ventrals broad ; anal 

 lower than dorsal ; an oblique, pale streak below eye. Coast of Cuba, 

 caught in nets at night; rare. (Poey.) Probably a species of Collettia, 

 and apparently related to C. rafinesquei, but this is not certain, (noc- 

 turnus, nocturnal.) 

 Myctophum noclurnum, POEY, Memorias, n, 426, 1861, Cuba. (Coll. Poy.) 



265. RHINOSCOPELUS, Liitken. 



Alysia, LOWE, Proc. Zbol. Soc. London, 1839, 87, (loricata=coccoi; name preoccupied). 

 Rkinoscopelus, LUTKEN, Vid. Selsk. Naturv. Copenhagen, vii, 1892, 237, (coccoi). 



Body oblong, slender, compressed, with slender and elongate caudal 

 peduncle covered with smooth, stiff scales, those in the lateral line much 

 larger than the others. Head compressed ; cleft of mouth very wide ; the 

 jaws about equal, the snout projecting beyond the tip of lower jaw. Pre- 

 maxillary long and slender ; maxillary well developed, reaching nearly or 

 quite to the angle of the preoperculum, without considerable posterior 

 dilation. Teeth in villiform bands in the jaws, on the palatines, ptery- 

 goids, and tongue. Eye moderate, its diameter less than i of the length 

 of the head. Gill rakers very long and slender. Dorsal fin premedian; 

 pectoral large ; adipose dorsal small ; anal fin larger than dorsal ; pec- 

 toral narrow, elongate. Precaudals 2 ; supra-anals about 18, in two 

 groups, the break being over the middle of the long anal fin and at the 

 end of the first third of the series, approximately; auterolaterals 1 or 2; 

 mediolaterals 2 or 3. Species few, mostly of the Atlantic. (*piv, snout; 

 Scopelus.) 



a. Supra-anal spots forming an obtuse angle; anal spots 15 to 20. coccoi, 851. 



au. Supra-anal spots in a straight, oblique series; anal spots 13 to 17. ANDREW, 852. 



aaa. Supra-anal spots not in a straight line series; anal spots 12 to 13. RARUS, 853. 



851. RHINOSCOPELUS COCCOI (Cocco). 



Head 5i; depth 4$ to 5 ; eye 4. D. 10 to 12 ; A. 20 or 21 ; V. 8; scales 

 1-41-3. Tail slender, elongate, its least depth $ height of body. Distance 

 between posterior margin of orbit and preorpercular edge diameter of 

 eye. Preopercular edge obliquely descending. Snout conical, the upper 

 part projecting beyond the lower, the upper and lower profiles nearly 

 equally curved ; maxillary extending to the angle of preoperculum and 

 scarcely dilated. Dorsal origin nearer end of snout than to root of caudal, 

 and behind base of ventral ; last ray of the dorsal in vertical from second 

 anal ray ; pectoral reaching middle of ventral. In some specimens each 

 of the scales on the back of the tail has a pearl-colored dot, probably a 

 sexual character of the male; back and nape blackish; sides silvery, 

 with gold and silver reflections; inside of the mouth blackish; iris sil- 

 very, the pupil transparent. (Goode & Bean.) Western Atlantic, very 

 abundant among the surface fishes of the Gulf Stream, rare in the Medi- 

 terranean, and ranging from Newfoundland to Africa. (Named for Anas- 

 tasio Cocco, an Italian naturalist, who carefully studied the deep-sea 

 fishes which he could secure.) (Eu.) 



* Goode & Bean adopt for this genus the name Stenobrachius. Stenobrachius, Eigenmann, was 

 intended to replace Alysia, but its type, leucopsarum, is a Nannobrachium aud not closely related to 

 the type of Alysia. 



