500 



BULLETIN 10O, UNITED STATES NATIONAL MUSEUM. 



large, as in C. smithl 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 (1.35 to 1.55) in postorbital; least suborbital width, 2.65 (2.5 to 



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II» 



Fig. 21. — Coelorhynchus radclipfei. 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 

 ■ill 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 



•■.-■ '•■■ 



Fig. 22. — Coelorhynciius 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. 



