540 Memoir Sears Foundation for Marine Research 



males with larger denticles along anterior margins of pectorals and near their outer cor- 

 ners;" denticles on lower surface with flat ovoid blades on very short pedicels, close-spaced 

 on outer parts of paired fins and on lower edge of tail sector of trunk, but abdomen and 

 inner parts of paired fins naked except for patches here and there. 



Head broadly rounded anteriorly, but its postero-lateral margin nearly straight, its 

 greatest breadth about 3 times as great as distance between spiracles or V3 as great as dis- 

 tance from snout to rear end of base of 2nd dorsal. Horizontal diameter of eye about 

 equal to maximum diameter of spiracle, the distance from eye to spiracle about as long as 

 horizontal diameter of eye. Distance between spiracles longer than between eyes by a 

 distance about equal to vertical diameter of eye. Distance from eye to nostril a little longer 

 than from eye to spiracle. Nostril terminal, its inner anterior margin with 2 barbels, the 

 outer barbel triangular with broad base and slender tip, the inner barbel narrow, widening 

 slightly outward, then tapering to pointed tip and rising from the base of the outer without 

 an intervening lobe. Both barbels smooth-edged or nearly so, the outer anterior margin 

 of nostril expanded as a smooth-edged, subtriangular lobe; the posterior margin of nostril 

 smooth."* Fold at front of head only slightly expanded in obtusely rounded contours out- 

 side corners of mouth. Mouth terminal, its breadth equal to about % of length of head. 

 Lower labial furrow extending about % of the distance toward center of mouth, but no 

 upper furrow. 



Teeth '^^° in specimen counted, alike in the 2 jaws, with erect, conical cusp on broadly 

 expanded base, the outermost teeth slightly the smallest; 3 rows functional in each jaw; 

 a broad gap at symphysis in each jaw. 



Dorsals similar in form, brush-shaped, with broadly rounded apex. First dorsal about 

 V5 as long at base as head, its vertical height a little greater than length of base, its origin 

 posterior to tips of pelvics by a distance about V2 as great as distance between eyes. Inter- 

 space between ist and 2nd dorsals about as long as between eyes. Second dorsal a little 

 smaller than ist. Interspace between 2nd dorsal and caudal about as long as between ist 

 and 2nd dorsals. Caudal between % and Yj of total length, its upper margin only about 

 % as long as its lower margin, both its corners rounded but the lower more broadly so, the 

 posterior margin moderately concave with a shallow obscure notch opposite termination of 

 caudal axis. Pelvics about 73 as long as exlreme length of pectorals, the anterior margins 

 weakly convex and distal margins nearly straight, their outer corners broadly rounded, 

 their posterior corners tapering with acute tip (about 40°). Transition from distal margin 

 to inner margin of pectoral marked by a definite subangular corner, its narrowly rounded 

 outer corner approximately a right angle, its outer margin nearly straight, distal margin 

 weakly concave, inner posterior margin moderately rounded and definitely notched at 

 axil; distance from anterior corner of pectoral to rear end of its base about 73 as great as 

 length along outer anterior margin, as is also the distance from outer corner to rear end of 



13. Clearly shown in a photograph of a 42j^-inch male from Chesapeake Bay (Hildebrand and Schroeder, Bull. 

 U.S. Bur. Fish., ^5 [i], 1928: fig. 30) and mentioned by Dumcril (Hist. Nat. Poiss., /, 1S65: 467, footnote). 

 24. More or less fringed in calif ornica. 



