2 84 Memoir Sears Foundation for Marine Research 



74.5, 74.2; pectoral 21.5, 20.4; pelvics 49.5, 49-7; anal 63.7, 63.0. 



Interspace between: ist and 2nd dorsals 21.4, 20.O; 2nd dorsal and caudal 6.8, 



7.3 ; anal and caudal 6.2, 7.9. 



Distance from origin to origin of: pectoral and pelvics 28.2, 29.2; pelvics and anal 



14.4, 13.2. 



Trunk very slender, its height at origin of ist dorsal (where highest) only about Ve 

 to y^ of its length to origin of caudal, without mid-dorsal ridge. Body sector from snout 

 to cloaca a little longer than tail sector. Caudal peduncle a little deeper than thick, without 

 lateral ridges but slightly rhomboid in cross-section. Precaudal pits subrectangular. 

 Dermal denticles close-spaced, usually overlapping, and so small that the skin is smooth to 

 the touch, their blades horizontal, as broad as long or broader, usually with 3, and occa- 

 sionally with 4 or 5, ridges, the apical margins weakly toothed to correspond} pedicels 

 short and stout. 



Head noticeably long, its length to origin of pectoral averaging about Vs of total 

 length. Snout conical, with narrowly rounded tip, noticeably long, its length in front of 

 mouth about % of length of head to origin of pectoral in large specimens and relatively 

 a little longer in small specimens. Eye broadly oval or nearly circular, with well de- 

 veloped nictitating membrane, its midpoint about opposite front of mouth, its hori- 

 zontal diameter between ^4 and % as long as snout in front of mouth. Gill openings 

 noticeably short, the 3rd longest, a little shorter than horizontal diameter of eye in 

 small specimens, but about twice as long as eye in large ones, the ist a little longer than 5th, 

 the 4th over or very slightly posterior to origin of pectorals." Nostril oblique, its inner end 

 a little nearer to front of mouth than to tip of snout, its anterior margin only slightly ex- 

 panded as a low, inconspicuous subtriangular lobe with rounded tip. Mouth evenly 

 rounded, a little less than % as high as broad," occupying about % of breadth of lower 

 surface of head. A deep pit at corner of jaw, concealed when mouth is closed, but sub- 

 triangular when open, and extending for a very short distance at approximately a right 

 angle onto the upper jaw but not onto the lower.^^ 



Teeth itZi °o ^n to 15 '"^ J^^^ examined; uppers so closely spaced that successive 



teeth overlap laasally, subtriangular, slightly longer than broad, oblique, their outer mar- 

 gins deeply concave and inner margins convex, with edges serrate; usually one tooth at 

 symphysis much smaller than those flanking it, but similar in form, its point directed 

 toward the right in some specimens, toward the left in others (this tooth is lacking occa- 

 sionally) ; next 4 or 5 teeth largest and about equal, the subsequent teeth successively 

 smaller toward the angle of the mouth, with the outermost very small; lower teeth erect, 

 much more slender than uppers toward center of mouth, but increasing in relative breadth 

 and decreasing in length toward angles of mouth, their margins usually very finely serrate, 



10. In a Japanese specimen, the third is similarly longest, and the fifth is slightly shorter than the first. 



11. 56 to 68 per cent in specimens examined. 12. Much as in Carc/uirhinus. 



