. Bulletin - United States National Museum. Science. 504 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. is very broad, and by maintaining its width forward more strikingly than usually, renders the sides of the snout much more convex dis- tally than in other species with a similarly long snout; its preocular length is contained times in head; its preoral length, times; its width at base, times in head, times in preocular length; the width of snout at the end of the ethmoid region of the infra- orbital ridge is equal to the length of snout anterior to that point. The ridges of t
. Bulletin - United States National Museum. Science. 504 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. is very broad, and by maintaining its width forward more strikingly than usually, renders the sides of the snout much more convex dis- tally than in other species with a similarly long snout; its preocular length is contained times in head; its preoral length, times; its width at base, times in head, times in preocular length; the width of snout at the end of the ethmoid region of the infra- orbital ridge is equal to the length of snout anterior to that point. The ridges of the head are prominent; the occipital ridges are but little divergent forward and backward; the least distance between them is contained times in the distance between either their an- terior or posterior ends, and is just half the least interorbital width. The preopercular margin is denticulate; the subopercle is produced backward into a sharply pointed flap. The orbit is smaller than usual in this group, its length being contained times in head, times in snout, times in postorbital. Least interorbital width,. Fig. 25.—Coelorhynchus weberi. Type. After Radcliffe (" Coelorhynchcs commutabilis, form eta "). in postorbital; least suborbital width, The upper jaw ex- tends from below the middle of anterior nostril backward to below the hind margin of orbit; its length is contained times in the head; barbel, in postorbital. Teeth villiform, in bands on jaws. Six branchiostegals; gill-membranes with a narrow free fold across isthmus. Distance from anus to base of outer ventral ray, two-fifths longer than orbit, contained times in length of head; distance between ventral and isthmus, nearly one-third longer than orbit, contained times in length of head; distance between anus and isthmus, in head. Scales large: in 4£ series between the lateral line and the origin of the second dorsal (excluding the lateral line series), in
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