128 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 43. 



along suborbital ridge have the ridges very distinct, strongly radiating; 

 other scales of head smaller, their ridges not so sharply defined. 



Tip of snout to origin of dorsal 2.92 in total length; first dorsal 

 spine inconspicuous; second 3.41 in head, long, slender, smooth 

 throughout; interdorsal space 4.02 in head, the base of first dorsal 

 being only about 0.55 of the interdorsal space; origin of anal under 

 origin of second dorsal, its rays much longer and stronger than those 

 of the second dorsal ; ventrals small, outer ray with a short filament, 

 its length 4.31 in head, tip not reaching vent, ventral base under base 

 of lower pectoral rays; pectoral 2.83, equal to postorbital part of 

 head. 



Color in alcohol: Hair-brown; the fins, their bases, and branchi- 

 ostegal membranes, dark clove-brown. 



Type.— Cat. No. 72944, U.S.N.M., 56 cm. in length, taken with a 

 beam trawl at station 5367 (lat. 13° 34' 37'' N.; long. 121° 07' 30" E.), 

 Verde Island Passage, Luzon, at a depth of 180 fathoms, on a bottom 

 of sand. 



In small specimens the snout is 2 in head; the eye is somewhat 

 larger; the outer ventral ray reaches to or beyond origin of anal; the 

 average number of radiating ridges on the scales is somewhat less, 

 the longitudinal ridges on head are more distinct, and the second 

 dorsal spine does not reach origin of second dorsal; in older examples 

 this difference is much greater. 



C. quadricristatus and fiabellispinis of Alcock, from the Indian 

 Ocean, and C. tokiensis of Steindachner and Doderlein, from Japan, 

 appear to be closely related species. From quadricristatus the main 

 differences are a much longer interdorsal space, fewer rays in the first 

 dorsal, and an absence of black cross bands on body. In fiabelli- 

 spinis the snout is shorter, the eye is larger, the interdorsal space 

 shorter, and scales between dorsal and lateral line in fewer number. 

 In tokiensis the interdorsal space is shorter, the tip of the second dorsal 

 spine reacliing beyond origin of second dorsal, the snout and head 

 shorter, and the eye larger. 



The collection contains nine examples 15.2 to 56 cm. in length, 

 taken at depths of 180 to 410 fathoms. 



CCELORHYNCHUS COMMUTABILIS Smith and Radcliffe, new species. 

 Plate 29, fig. 2. 



First dorsal ii,9 ; ventrals 7 ; pectorals 20. 



Head 3.37 in total length, long, relatively slender, subquadrangular 

 in transverse section, slightly deeper than broad, depressed ante- 

 riorly, dorsal surface with two pairs of low but well marked spinous 

 ridges, the inner pair on occiput slighth^ converging mesially, then 

 again slightly diverging, the outer pair continuous ^\ith the supra- 

 orbital margin, ending immediately in advance of the upper end of 



