386 Memoir Sears Foundation for Marine Research 



Teeth '■*°'- j^'^|°^— j^^'^ ^ upper teeth broadly triangular, their edges serrate, most 

 coarsely so toward base, the ist two erect, symmetrical, with nearly straight or very slightly 

 concave edges, but subsequent teeth weakly oblique, their outer margins considerably 

 more deeply concave in subangular contour, the ist to 9th or loth about equal in size, the 

 lOth to 14th or 15th successively smaller and more deeply notched, the outermost i or 2 

 very short; lower teeth erect, symmetrical, with narrow triangular cusps on broadly ex- 

 panded bases, serrate from tip to base but more finely so than uppers, the 2nd to 6th or 7th 

 a little the largest, the outermost 2 or 3 much the smallest; i to 3 small teeth at symphysis 

 in each jaw. 



First dorsal much smaller than in milberti, leucas or longimanus, its base appreciably 

 shorter than from eye to ist gill opening, its origin about over inner corner of pectoral or a 

 little posterior to latter, its anterior margin moderately convex toward tip, its posterior 

 margin much more deeply concave than in milberti or in springeri, its apex subacute, its 

 free rear corner slender and nearly V2 as long as base, the midpoint of its base about 1.6 

 times as far from origin of pelvics as from axils of pectorals. Second dorsal only about V3 

 as long at base as ist and relatively much lower, its free rear tip rather slender and about as 

 long as base or about i V2 times as long as the vertical height, its extreme length from origin 

 to tip about 2.5 its vertical height and therefore considerably greater relatively than in 

 s-pringeri; its origin over origin of anal or a little anterior to it. Caudal between Yz and V4 

 of total length (27 to 29%), its terminal sector a little less than % the length of the fin 

 and noticeably slender with narrowly rounded tip and moderately concave lower posterior 

 outline, the lower lobe (expanded lower anterior corner) about Vs to % (about 40%) as 

 long as upper and thus somewhat shorter relatively than in springeri, with moderately and 

 evenly convex anterior margin, nearly straight posterior margin and very narrowly 

 rounded or subacute tipj the re-entrant corner (included by the 2 lobes) moderately 

 rounded. Distance from origin of caudal to tip of anal about % as long as base of latter, 

 or about as long as its free rear corner. Anal about 1.2 times as long at base as 2nd dorsal 

 and almost 1.5 times as long on anterior margin but only a little higher vertically, its pos- 

 terior margin much more deeply incised, its free rear corner between % and % as long as 

 base, its tip a little anterior to tip of 2nd dorsal. Distance from origin of anal to tips of pel- 

 vics about 1.3 times as long as base of anal. Pelvics a little longer at base than anal, their 

 outer corners considerably more obtuse than a right angle (about 115°). Pectoral about 

 %o (78 to 91%) as long as head, a little less than V2 as broad as long, with subacute or 

 very narrowly rounded corners, usually with only weakly convex outer margin and 

 weakly concave distal margin, as is the right-hand fin on specimen illustrated, but some- 

 times with much more strongly convex outer edge and concave distal edge, as is the left- 

 hand fin on this same specimen (Fig. 71)."' 



Color. Back and upper sides, including upper surfaces of pectorals, bluish or leaden 



116. A striking example of variability in this genus, illustrating the danger of basing specific distinctions on small 

 diflEerences in the shape of a given fin. 



