438 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



22. COELORHYNCHUS QUINCUNCIATUS, new species* 



Type-specimen,— Cat^o. 78213, U.S.N.M., a mature female 237 

 mm. long to end of a pseudocaudal of 7 rays, or 93.3 mm. to anus: 

 from Albatross station 5392, between Samar and Masbate, in 135 

 fathoms. 



List of paratypes. 



This species is not recorded at depths so great as are G. argentatus 

 (318 fathoms) and G. thompsoni (200 fathoms). 



In the description which follows, those measurements and counts 

 included in the parentheses after each measurement or count of the 

 type, were taken on paratypes 60 to 77 mm. long to anus. When 

 markedly different, there are added, separately, the measurements 

 of three smaller specimens, 50 to 57 mm. long to anus. 



Fin-rays — first dorsal, II, 9 (or II, 10) ; pectorals, 16 (to 18) ; 

 ventrals, 7. 



The greatest depth of the body is contained 2.1 (1.85 to 2.3) times 

 in the head ; the greatest width, across the pectoral bases, 3.0 (2.5 to 

 3.3) times. The dorsal contour is slightly concave on the snout and 

 weakly convex between the snout and the first dorsal. The snout 

 closely resembles that of G. argentatus; it has a slightly acuminate 

 tip, which is on a horizontal passing below (or through) the lower 

 margin of the pupil. The proportions of the snout follow : preocular 

 length, 2.4 (2.3 to 2.55) in head; preoral length, 3.15 (2.8 to 3.3) ; 

 width of snout at front of orbits, 3.5 (3.33 to 3.5) ; width across 

 snout at anterolateral angles, 1.2 (1.1 to 1.3) in the distance anterior 

 to the angle. The occipital ridges diverge strongly toward both 

 ends; the least distance between them is contained 3.0 (2.9 to 3.3) times 

 in the interorbital ; the ridge is followed by a naked groove which 

 bounds above that area of scales which covers the large sensory canal 

 anterior to the origin of the lateral line. The postorbital ridge 

 curves slightly downward behind the preopercular angle. Length of 

 the orbit in the type-specimen (93.3 mm. to anus), 4.65 in head, 1.9 in 

 snout, 1.7 in postorbital; orbit in specimens 60 to 77 mm. to anus, 

 4.0 to 4.15 in head, 1.65 to 1.75 in snout, 1.35 to 1.5 in postorbital; 

 orbit in paratypes from 50 to 57 mm. to anus, 3.9 in head, 1.6 in 

 snout, 1.3 in postorbital. The least interorbital width (anterior to 



