340 Memoir Sears Foundation for Marine Research 



nearly or quite as close to tip of snout as to mouth and about equidistant between rear 

 edge of eye and tip of snout j its anterior margin slightly expanded in obtusely triangular 

 outline with rounded corner. Mouth broadly ovate, its height about ^ its breadth. Upper 

 labial furrow very short even for this genus, and at approximately a right angle with the 

 jaw. 



^^^^^ ia or 13—1 ^12071!' uppsfs broadly triangular, both edges regularly and moder- 

 ately coarsely serrate from base to tip, the first 2 teeth erect and nearly symmetrical, with 

 both margins slightly concave, but 3rd and subsequent teeth with only very slightly con- 

 cave or nearly straight inner margins, and outer margins increasingly concave toward cor- 

 ners of mouth, the outermost 3 or 4 teeth rather definitely notched j lower teeth with 

 narrow triangular cusps on broad bases, nearly erect in front and sides of mouth and only 

 slightly oblique toward its corners, the cusps successively shorter from 8th or 9th to 12th 

 or 13th, both edges serrate, but more finely so than on uppers. One small symmetrical 

 tooth at symphysis in each jaw. 



First dorsal noticeably large, its origin about over or a little anterior to axil of 

 pectoral, its vertical height about % (40-45%) as great as distance from tip of snout to 

 origin of pectorals, its base nearly as long as its anterior margin, its anterior margin 

 nearly straight, its apex subacute or very narrowly rounded, its posterior outline moder- 

 ately concave (a little the more so basally), its free rear corner relatively obtuse and only 

 about V4 as long as its base, the midpoint of latter only a little more than Ys as far from 

 axil of pectoral as from origin of pelvics. Second dorsal about % (41%) as long as ist 

 at base, relatively lower, its origin over or a little anterior to that of anal,^" its anterior 

 outline nearly straight, apex rounded, posterior outline only weakly concave, its free rear 

 corner broad and about V2-% as long as its base, its rear tip definitely though only a little 

 anterior to that of anal and separated from origin of caudal by a distance about % as long 

 as its base. Caudal with weakly convex upper margin and subacute tip, the narrow-tri- 

 angular terminal sector about Y^ the total length of fin, the lower lobe (expanded lower 

 anterior corner) a little less than Y2 (about 44%) as long as upper, with moderately con- 

 vex anterior outline, nearly straight posterior outline and narrowly rounded tipj the 

 re-entrant corner, included by the 2 lobes, broadly rounded. Distance from origin of 

 caudal to tip of anal about V2 as long as base of anal (a convenient field mark separating 

 this species from longhnanus) . Anal with base and free rear corner about as long as those 

 of 2nd dorsal, but anterior margin about i Vs times as long and more convex, and posterior 

 edge much more deeply incised. Distance from origin of anal to tips of pelvics only about 

 Y2 to % as long as base of former (longer than base of anal in longimanus) . Pelvics with 

 nearly straight anterior margins and slightly concave distal margins, their bases a little 

 longer than base of anal. Pectoral nearly as long (about 87%) as head to origin of 

 pectoral, about Y2 as broad as long, the outer margin nearly straight toward base but 



io. The origin of the second dorsal is about over that of the anal in the female studied, but a little anterior to it in 

 male embryos and in a tracing of an adult male contributed by Stewart Springer. 



