500 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
large, as in C. smithi and other species, being contained 3.7 (3.4 to 
3.75) times in the length of head, 1.4 (1.2 to 1.7) times in the snout, 
1.2 (1.05 to 1.25) times in the postorbital. Least interorbital width, 
1.45 (1.85 to 1.55) in postorbital; least suborbital width, 2.65 (2.5 to 
Fig. 21.—CokLORHYNCHUS RADCLIFFEI. PARATYPE. ADULT. 
2.85). The size of the mouth is proportionately much greater in 
large specimens; the upper jaw extends backward from below (or in 
front of) the anterior nostril to below the hind margin of the pupil 
in the smallest specimens, but to below the hind margin of the orbit 
in the largest; its length is contained in the head from 4.4 times in 
—— 
Fic. 22.—CoELORHYNCHUS RADCLIFFEI. PARATYPE. YOUNG. 
the smallest, to 3.3 times in the largest, specimens; 3.8 times in the 
type, from 3.55 to 3.8 times in specimens from 90 to 110 mm. long to 
anus. Length of barbel, 3.4 (to 4.7) in postorbital. The teeth are 
villiform on the jaws. Six branchiostegals; gill-membranes with a 
very narrow free fold. 
