PHILIPPINE MACROUROID FISHES GILBERT AND HUBBS. 



459' 



Summarized table of proportions of parts of head. 



Length of head in mm 



Orbit in head 



Orbit in postorbital 



Orbit in snout 



Intcrorbital in postorbital. 



Maxillary in head 



Barbel in postorbital 



Preocular length of snout . . 



Preoral length of snout 



Width of snout 



Type. 



49.5 

 3.50 

 1.15 

 1.33 



1.55 

 4.05 



2.50 

 2.95 

 2.50 



Maxi- 

 mum. 



57 

 3.50 

 1.15 

 1.30 

 1.55 

 3.70 

 3.40 

 2.48 

 2.90 

 2.50 



Mini- 

 mum. 



3.90 

 1.34 

 1.55 

 1.85 

 4.05 

 4.60 

 2.60 

 3.05 

 2.85 



Average. 1 



3.68 

 1.27 

 1.40 

 1.72 

 3.86 

 4.07 

 2.56 

 2.98 

 2.67 



Young. 



43 

 3.55 

 1.15 

 1.40 

 1.65 

 4.10 

 4.00 

 2.48 

 3.10 

 2.70 



1 Based upon 5 to 7 specimens in each case (type included). 



The preceding table indicates certain of those differences which 

 distinguish O. sexradmtus from C . notatus, the snout being longer 

 and the orbit smaller. 



FlG. 11. COELORHYNCHUS SEXRADIATDS. TlTE. 



The posteroventral angle of the subopercle is sharply produced 

 backward (and slightly downward). The interorbital width is least 

 above front of pupil; least suborbital width, 2.5 (to 2.7) in postor- 

 bital. The maxillary subtends the anterior two-thirds of the orbital 

 length. Bands of fine teeth occur on the jaws; the outer premax- 

 illary series is not enlarged. Six branchiostegals. The gill-mem- 

 branes form a narrow free fold across the isthmus. 



The anus is located near the origin of the anal fin, the interspace 

 being contained 3.7 (to 2.9) times in the distance between the anus 

 and the base of the outer ventral ray, which is contained 1.05 (to 1.4) 

 times in the postorbital length of the head. The distance between 

 the outer ventral ray and the isthmus is slightly shorter than the dis- 

 tance between the anus and the ventral fin (slightly longer in one 

 paratype). 



A narrow, darkly pigmented, naked fbssa, widening anteriorly, 

 extends forward from the anus to between the front of the ventral 

 bases. 



