466 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



28. COELORHYNCHUS TRIOCELLATUS, new species. 



Type-specimen. — Cat. No. 78218, U.S.N.M. ; a male 190 mm. long to 

 the end of a pseudocaudal, 65 mm. to the anus; dredged at Albatross 

 station 5575, north of Tawi Tawi, at a depth of 315 fathoms, where 

 the bottom temperature was recorded as 52.3° F. 



This species, quite handsomely marked for a bathybial type, is 

 closely related to both G. notatus and sexradiatus, but resembles 

 notatus most. .Comparison between these forms has already been 

 given in the analytical key to the species of Coelorhynchus, and will 

 be repeated in some detail in the course of the following description. 

 C. trioeellatus is also related to the following species, which, how- 

 ever, lacks the ventral fossa. 



Fin-rays — first dorsal, II, 9; pectorals, 17-16; ventrals, 7-7. 



Fig. 12. — Coelorhynchus triocellatus. Type. 



The body is slender and comparatively strongly compressed; its 

 greatest depth is contained 1.9 times in the head ; its width across the 

 pectoral bases, 2.5 times, being equal to the depth of the body below 

 the origin of the lateral line, or to the total depth of the body 

 at a point twice the head's length behind the tip of the snout ; at that 

 point the width of the body is contained 3.4 times in the depth. 

 The dorsal contour is concave on the snout, but straight on the 

 postorbital portion of the head, and horizontal on the tail behind 

 the first dorsal fin. The snout in this species is diagnostically long, 

 slender, and sharply pointed, with sides but little convex. Its pre- 

 ocular length is contained 2.32 times in the head; the preoral length, 

 2.45 times; its width opposite front of the orbits, 3.0 times. The pos- 

 teroventral angle of the subopercle is produced backward into a 

 pointed flap. Length of the orbit, 3.6 in head, 1.05 in postorbital, 1.6 

 in snout; least interorbital width, 1.6 in postorbital; least suborbital 



