2300 Bulletin 4.7, United States National Museum. 



respect the species resembles most strongly G. semwinctus, from which it 

 varies widely in the general form and proportions. Snout extremely 

 short, scarcely equaling diameter of the minute eye; diameter of orbit 

 about 7 in head. Mouth oblique, the maxillary 4 in head, reaching nearly 

 to vertical from posterior margin of orbit. Lips without fringes. Eyes 

 separated by a narrow septum, the interorbital width being less than the 

 diameter of the pupil. Opercular fringes few and small, flat, and not 

 terminating evident ridges as in Dactyl oscopus. Dorsal beginning well 

 forward, its origin less than diameter of orbit behind the posterior line 

 of occiput ; anterior detached part of fin consisting apparently of 3 rays, 

 the first of which is the longest, the second and third equal and short; 

 fourth spine again longer; spines as usual slenderer than the rays, and 

 showing no articulations,but with some difficulty discriminated from them; 

 pectoral as long as head. Anterior part of lateral line running immediately 

 along base of dorsal, without intervening scales, as in other members of 

 this genus. It is much longer than in G. arenicola and is contained 1 

 times in the posterior median portion. There are 3 scales between the 

 posterior part of the lateral line and the base of the dorsal. Color similar 

 to that of G. arenicola and G. semicinctus, light olivaceous, unmarked below 

 the middle of the sides, the back and upper half of sides with 8 brown 

 bars which extend downward to lateral line; the upper part of each bar 

 with a lighter central area, the light areas between the bars marked 

 more or less with brown, which sometimes forms indistinct secondary bars; 

 a blackish bar at base of caudal, and a faint streak below eye; a large 

 pearly blotch on opercle. A single specimen, about 2 inches long, from 

 Albatross Station 2828 in the Gulf of California. (Gilbert.) (ornatns, 

 adorned.) 



Gillellus ornatus, GILBERT, Proc. TJ. S. Nat. Mus. 1891, 558, Gulf of California. (Coll. 

 Gilbert.) 



853. DACTYLOSCOPUS,* Gill. 



Dactyloscopus, GILL, Proc. Ac. Nat. Sci. Phila. 1859, 132 (tridigitatus) . 

 Esloscopus, JORDAN & EVERMANN, Check-List Fishes, 465, 1896 (zelotes). 



Body moderately elongate, covered with rather large, cycloid scales; 

 head cuboid, oblong, and nearly flat above ; eyes small ; interorbital space 

 broad; mouth nearly vertical; lower jaw not dilated beneath nor emargi- 

 nate in front, without barbels; no intralabial filament; teeth villiform, 

 on jaws only ; pseudobranchise very small or obsolete. Dorsal commenc- 

 ing at the nape, with 6 or 12 slender spines, the soft rays numerous ; anal 



* This genus is thus denned by Dr. Gill : ' ' Body elongate with the dorsal and abdominal 

 outlines slowly converging to the caudal fin. Scales large, regularly imbricated. Lateral 

 line straight, and running along the middle of the side. Head oblong, snbcubical, and 

 smooth. Preopercle entire, opercle radiately fringed behind. Mouth nearly vertical. 

 Tongue thick, narrowed anteriorly, attached to the floor of the mouth. Labial velum 

 without a barbel. Anus a short distance behind the base of the pectoral fins. Dorsal fin 

 subequal, single, and very long, commencing above or before the anus and continued 

 almost to the base of the caudal. Anal fin commencing behind the anus, and with the 

 same form and termination as the dorsal. Caudal fin small and narrow, posteriorly sub- 

 truncated. Pectoral fins subangular. Ventral fine jugular, closely approximated, and 

 each with 3 stout simple and articulated rays," 



