PHILIPPINE MACROUROID FISHES GILBERT AND HUBBS. 467 



width, 2.5. The maxillary subtends the anterior two-thirds of the 

 orbit; the length of the upper jaw is contained 4.5 times into the 

 head. The villiform teeth, as usual, are in bands on the jaws; the 

 outer premaxillary series is scarcely enlarged. The short barbel is 

 contained 5.7 times in the postorbital. Six branchiostegals ; gill- 

 membranes with a free fold. 



In the location of the anus this species occupies a position inter- 

 mediate between that of C. notatu§ and that of C. sexradiatus, the 

 distance from the center of the anus to the origin of the anal being 

 contained 2.6 times in the distance between the anus and the base 

 of the outer ventral ray; the latter distance is contained 1.1 times 

 in either the postorbital or the distance from the ventral fin to the 

 isthmus. 



A darkly pigmented and very narrow ventral fossa extends for- 

 ward from the peritroct only to opposite the posterior ends of the 

 ventral bases. 



The scales are in 54- series from the origin of the second dorsal to 

 but excluding the lateral line scales. The spinous carinae on the 

 scales of the body, 7 to 10 in number, are similar in strength to those 

 of notatus, but bear 9 or fewer longer, sharper, and more curved 

 spinules ; these spinules are much longer, sharper, more slender, and 

 more widely spaced than those of O. sexradiatus. The squamation 

 of the head is so similar to that of C. notatus that only the features 

 apparently diagnostic need be described. The scales as a whole 

 differ in bearing fewer carinae and fewer spinules. The acute dorso- 

 terminal plate is much longer than in any of the preceding species, its 

 length being contained only 2.9 times in the postorbital ; its spinules 

 are arranged in three series radiating from its tip, being much re- 

 duced in size along the double median series. There are G scales on 

 the ethmoid, 7 or 8 on the preorbital, series of the infraorbital ridge, 

 and 9 on the mediorostral ridge. The median of the three spinous 

 ridges on the occipital scute is the strongest ; a scale nearly half the 

 distance from the scute to the dorsal fin is enlarged and strengthened 

 after a somewhat similar fashion. The median of the three series 

 of scales between the occipital and postorbital ridges is enlarged. 

 The anterolateral region of the snout is largely covered with prickles, 

 leaving only a narrow naked groove lateral to the single series of 

 scales bounding the median rostral row. In addition to these prickles, 

 and to the longer dorsoterminal plate, the scales on the head of trio- 

 ceUatus differ from those of sexradiatus chiefly in bearing fewer and 

 more divergent carinae. The underside of the head and the nasal 

 fossa are completely scaleless.. 



The first dorsal spine is very short, stout, and sharp ; the second 

 is long and filamentous, 1 being contained 1.12 times in the head (the 



1 The fin-rays are probably shorter in the female. 



