1920 Bulletin //, United States National Museum. 



put on its posterior line. Body with a dorsal series of imbricated spinous 

 plates similar to those in E. asprellus; but the plates are smaller, with 

 less evident keels and shorter spines; along its anterior third the series is 

 accompanied above by a narrow band of smaller plates, which are con- 

 tinued anteriorly on sides of occiput, and merge anteriorly into the patch 

 behind the eyes ; posterior portion of snout, the opercles, and the posterior 

 line of occiput with spinous scales; head otherwise naked. Vertical fins 

 with long slender rays as in E. asprellus ; dorsal fins separate, but the 

 interspace less than diameter of pupil ; distance from front of anal to vent 

 equaling f diameter of orbit; ventrals short, reaching halfway to front 

 of anal ; pectorals reaching slightly beyond front of anal, | length of 

 head. Color light olive or grayish, the lower parts unmarked, the breast 

 and belly silvery; back crossed by 4 wide brownish-olive cross bars, the 

 anterior of which under spinous dorsal becomes merged into the general 

 brownish-olive coloration of upper portion of head and nape; edges of 

 bands sharply denned and marked with concave indentations where 

 encroached upon by roundish light-colored areas; spaces between bands 

 slightly dusky and marked with some irregular, small, dark blotches 

 along middle of sides ; anteriorly on the back are pairs of round, light- 

 colored spots with darker edges, some of them showing silvery pigments ; 

 a small silvery spot above base of each pectoral fin; a narrow dark line 

 across occiput behind eyes; dusky blotches on cheeks; a dark bar across 

 maxillary and lip ; a pair on maxillaries ; 2 faint dark bars on the caudal 

 fin, the fins otherwise translucent or whitish, unmarked, differing from 

 Eadulinus asprellus in the much smaller eye, the scaled interorbital space, 

 the presence of supraocular and occipital filaments, the smaller size and 

 weaker spines of plates of the dorsal series, and the different coloration. 

 Only the type known, a young female 72 mm. long (No. 48795, U. S.'Nat. 

 Mus.) from Albatross Station 3664, off Santa Catalina Island, California, in 

 59 fathoms. (/>oAz, dart ; sido$, resemblance from its marked likeness to 

 the Darter, Boleosoma.) 



2298. RADTJLDTUS ASPRELLUS, Gilbert. 



Head 4i to 4; depth 8| to 9|. D. VIII to X, 21 or 22; A. 23 or 24; lat- 

 ,eral line 38 to 40. Body very elongate, the greatest depth at occiput, 

 !$ in width of head. Body subquadrate in cross section, the upper angles 

 being formed by the keel of lateral plates, tapering gently to the very 

 slender, flat caudal peduncle, everywhere as wide as or wider than deep. 

 Eyes large, closely approximated, the interorbital space very narrow, 

 not grooved, less than pupil; orbit 2f to 2f in head. Mouth small, 

 reaching front of pupil, 2f in head. Preopercular spines 2 only, short, 

 simple, the lower directed backward, the upper backward and upward; 

 nasal spines long and strong, a depression behind them; head other- 

 wise smooth; occiput not ridged; a series of large, keeled, spinous 

 plates along lateral line, running high on sides, their free edge turned 

 obliquely upward, and armed with from 1 to several long spines rnesially, 

 and shorter ones above and below; a row of minute spinous plates 

 along upper edge of series anteriorly, the series along lateral line con- 



