360 PROCEEDINGS OF THE XATIONAL MUSEUM. vol.42. 



9. CYCLOGASTER INGENS, new species. 



Plate 43, fig. 1. 



Type.— C&t. No. 73330, U.S.N.M. A male, 490 mm. long, from 

 station 4863, off the coast of Korea, in the Sea of Japan; depth 250 

 fathoms. 



Measurements in hundredths of total length, excludhig the caudal 

 fin (410 mm.): Length of head 31.5; depth opposite front of disk 

 25.5; opposite gill slit 30; greatest width of head 24.5; greatest 

 depth of body 30; depth of caudal peduncle 4; interocular width 12; 

 diameter of eye 3; width at angles of mouth 18.5; distance from tip 

 of snout to end of maxillary 16.5; length of gill slit 14; distance from 

 tip of snout to disk 18.5; to anus 38.5; diameter of disk 11 ; distance 

 from disk to anus 9.6; from anus to front of anal fin 8.5; from tip of 

 snout to front of dorsal 34; longest pectoral ray 22; longest ray of 

 lower lobe 18; shortest ray in notch. 



Dorsal 45; anal 37; pectoral 42. 



Body deepest at union with head, rather elongate and weak pos- 

 teriorly and much compressed; head heavy, occiput swollen, profile 

 rising very obliquely from snout; cheeks slightly swollen; snout 

 short, deep, rising abruptly; upper jaw projecting so that nearly all 

 the upper teeth are exposed; anterior nostril in a short wide tube; 

 eye small; mouth wide; maxillary reaching vertical from slightly 

 behind eye; posterior teeth slender, depressible and weakly trilobed, 

 the anterior teeth becoming progressively smaller, those along the 

 front of each jaw extremely minute; about 20 oblique rows in the 

 half of the lower jaw and 30 in the upper. Gill slit wide, extending 

 down in front of 16 pectoral rays. 



Origin of dorsal slightly behind tip of gill flap. Caudal injured, its 

 union with dorsal and anal apparently equal to half or more than half 

 of its length. Pectoral notched, the lower lobe reaching two-thirds 

 the distance from the disk to the vent. Disk rather large, separated 

 from vent by a distance nearly equal to its own diameter. 



Body and vertical fins dusky, with bluish black mottlings; margin 

 and posterior surface of head and body pale. 



Minute thumb-tack prickles sparsely distributed on top of head, 

 on dorsal fin, and on sides of body; lower parts, including anal fui 

 and a strip along its base, the terminal part of snout, lower part of 

 cheeks and opercles, the pectoral fin and its axil naked. 



This species differs from C. ocliotensis in having a shorter jaw and 

 a longer slenderer body. It appears to have more oblique series of 

 teeth in the upper jaw than in the lower (30-20), while C. ochotensis 

 has about the same number (25) in each jaw; but this may have 

 little significance, as in these species the total number of rows in 

 adults has been increased by the more or less irregular intercalation 

 of secondary rows. Ingens is a deep-water species (250 fathoms) from 

 off the Korean coast. The form is more slender and the texture less 



