366 Memoir Sears Foundation for Marine Research 



back evenly rounded, without dermal ridge. Precaudal pits semilunar in outline, the 

 upper the deeper, but the lower also well marked. Dermal denticles so close-spaced and 

 evenly overlapping that the skin is wholly concealed, but their blades raised enough from 

 skin to feel slightly rough when stroked from rear to front, broader than long, with 

 mostly 7 (rarely 5) low ridges, their posterior margins broadly ovate or subangular, with 

 7 very short teeth (shorter than in limhatus) or even entire in some cases; pedicels very 

 short. 



Head a little less than V4 of total length and flattened above anterior to gill region. 

 Snout rather thin-tipped, ovate, with narrowly rounded tip (relatively somewhat longer 

 and more pointed than in limiatus), its length in front of a line connecting outer ends of 

 nostrils about % as great as distance between inner ends of latter, and length in front of 

 mouth about Vs as great as length of head. Eye approximately circular, and noticeably 

 small, its diameter only about Vo (11%) as great as length of snout in front of mouth. 

 Gill openings noticeably large, the 3rd (longest) nearly as long as distance between nos- 

 trils or about 5 times as long as diameter of eye (only about 2.5 times as long as diameter of 

 eye in limbatus), the 5th a little less than % (73%) as long as 3rd, the 4th over origin of 

 pectoral. Nostril strongly oblique, its inner end nearer to mouth than to tip of snout by a 

 distance a little more than twice as great as diameter of eye, its anterior margin sinuous, 

 with low, rounded expansion near inner end. Mouth ovate, about Yo as high as broad, 

 occupying only about % of breadth of head. Upper labial furrow about as long as nostril, 

 thus considerably longer relatively than in limbatus. 



Teeth ^^ "^ Hzl^il'^ti" ^^ '"^ specimen examined; uppers with narrow triangular cusps 

 on broad bases, smaller and relatively narrower than in limbatus (cf. Fig. 66 C-E with 

 62 C and 63 C, D), the first 3 nearly symmetrical and erect, but 4th and subsequent teeth 

 slightly oblique, with outer margin more deeply concave than the inner toward base, and 

 decreasing in length toward corner of jaw, the outermost 3 very low, the edges regularly 

 though finely serrate, except that the tips are smooth-edged; lowers with much more 

 slender cusps than uppers, on very broad bases, their tips not recurved forward as they are 

 in limbatus, very slightly oblique along whole length of jaw, the ist smaller than 3rd, 

 and 1 2th and 1 3th to 1 6th again successively smaller, the edges perfectly smooth on base as 

 well as on cusp; 2 minute teeth at symphysis in upper jaw and i in lower. 



Origin of ist dorsal a little posterior to inner corner of pectoral, its apex rather 

 narrowly rounded, its free rear corner relatively obtuse and only about Yz as long as its 

 base, the base about % as long as anterior margin, its vertical height a little less than Y2 as 

 long as head or about V2 as long as pectoral, the midpoint of base about % as far from axil 

 of pectoral as from origin of pelvics. Second dorsal a little less than Yz as long at base as 

 1st dorsal, its origin about over origin of anal, its free rear tip about as long as the base, 

 and noticeably more slender than that of ist. Caudal about Yi of total length, the ter- 

 minal sector a little less than Yi of the fin, slender, with narrowly rounded tip, the 

 lower lobe (expanded lower anterior corner) a little less than V2 as long as upper, with 

 moderately convex lower anterior margin and very narrowly rounded or subacute tip, the 



