492 Memoir Sears Foundation for Marine Research 



slender, blunt-tipped cusps directed inward into the mouth; those of each row over- 

 lapping the row next behind; about ten rows of teeth in function simultaneously 

 in each jaw in both sexes. Series of abnormally wide teeth are rather common in 

 both sexes. ^2 



Cephalic fins about twice as broad (basally) as long, tapering to blunt tips, their 

 shape as shown in Fig. 113; their anterior margins level with median sector of anterior 

 margin of head, their dorsoventral axes sloping a little outward from above to below, 

 their bases terminating about under spiracles at level of lower surface of head; their 

 lower margins rolled outward-upward when swimming but flattened when feeding 

 (p. 493), the anterior parts capable of curving inward toward mouth. Main portions of 

 pectorals originating close posterior to spiracles and on a level with latter, or a little 

 higher; anterior margins of pectorals nearly straight from points of origin but increas- 

 ingly convex toward outer corners; posterior margins moderately and evenly concave; 

 outer corners subangular; rear corners narrowly rounded or subangular; inner margins 

 moderately convex, about half as long as distance between eyes. Dorsal fin with mod- 

 erately convex anterior margin and broadly rounded apex; posterior margin indented 

 basally, as illustrated in Fig. 1 13 A; its origin about opposite axils of pectorals; its free 

 rear corner about even with rear corners of pelvics; its base about Vs as long as distance 

 between eyes; its vertical height about 72—80 "/o as great as length of its base. Pelvics 

 noticeably small, extending only a little beyond posterior corners of pectorals; anterior 

 margin nearly straight; posterior contour obtusely wedge-shaped, with blunted corner; 

 length along anterior (outer) margin about 64-70 "/o as great as distance from origin 

 of pelvic to rear corner. Claspers of mature male extending beyond posterior corners of 

 pelvic fins for a distance about as great as extreme length of dorsal; cylindrical, with 

 a keel-shaped projection capable of erection near the tip.*^ 



Cranium produced anteriorly at either side as a rounded prominence, supporting 

 anterior cartilages of cephalic fins. 



Color. Upper surface of disc and pelvics, dorsal fin, and both upper surface and 

 sides of tail blackish brown in western Atlantic specimens (after preservation), the dark 

 shade extending down sides of head to surround eyes and forming a conspicuous blotch 

 onto lower surface on each side close posterior to them; upper margins and inner 

 terminal portions of cephalic fins of same dark color as back. Outer surfaces of cephalic 

 fins and lower surface of disc and tail pale yellowish or grayish white except for the dark 

 ocular blotch mentioned above; tips of pelvics more or less dusky. Living specimens 

 are described as black above, changing soon after death to dark blue and then back 

 to black again if placed in alcohol.^* Blue specimens, apparently of this species, have 

 been described from tropical West Africa. '* 



92. Our description of the teeth of males is based on published accounts (Pellegrin, Bull. Soc. philom. Paris, [lo] 4, 

 1912: 97, fig. 3; RadcIifFe, Bull. U. S. Bur. Fish., 34, 1916: 279, pi. 48, fig. 3). For discussion of abnormal teeth 

 with photographs, see Gudger (J. Elisha Mitchell Sci. Soc, 41), 1939: 92, pi. 2). 



93. For details, see Leigh-Sharpe (J. Morph., 42, 1926: 317-318, fig. 12). 



94. Coles, Bull. Amer. Mus. nat. Hist., 2S, 1910: 342; Bull. Amer. Mus. nat. Hist., J5, 1916: 653. 



95. As Cephaloptera rochebrunei; see Synonyms, p. 494. 



