SCYMNODON SQUAMULOSUS. 209 



the pectorals to those of the ventrals. First dorsal narrow; second twice as 

 wide, origin above the hind extremities of the bases of the ventrals. Caudal 

 short and deep. Scales small tricarinate with short pedicel. 



Reaches a length of about four feet. 



Uniform brown to blackish. 



Taken off the coasts of Portugal in deep water, and off the coast of Soudan, 

 at a depth of 1,400 metres. 



SCYMNODON SQUAMULOSUS. 



Centrophorus squamulosus Gunth., 1877, Ann. mag. nat. hist., ser. 4, 20, p. 433; 1887, Challenger 



rept. Zool., 22, p. 5, pi. 2, f. B. 

 Zaun us squamulosus Jokd. & Fowler, 1903, Proc. U. S. nat. mus., 26, p. 633. 

 Scymnodon squamulosus Regan, 1908, Ann. mag. nat. hist., ser. 8, 2, p. 48. 



Head depressed; snout bluntly rounded, length about equal the distance 

 from the angles of the mouth to the first gill opening. Nostrils oblique, at the 

 end of the anterior third of the preoral length, with a small sharp process in the 

 middle of the anterior valve. Mouth slightly arched, width less than the length 

 of the snout, with a deep straight groove at each angle, and short labial folds of 

 which the upper is longest, besides a fringed upper lip. Teeth smooth on the 

 edges; upper more slender,- nearly erect; lower broader, with a triangular cusp 

 on a subquadrangular base, nearly erect at the symphysis, oblique toward the 

 angles. Spiracles little above the level of the eye and about one length of the 

 orbit farther back. Gill openings small, upper ends in front of the pectoral. 

 Pectorals small, inner angle blunt and not produced. Dorsal spines hardly 

 produced beyond the skin. Base of first dorsal in the middle of the distance 

 from the end of the snout to the caudal fin, length less than one fifth of the 

 interdorsal space, fin narrow. Second dorsal much larger than the first, origin 

 above the hind parts of the bases of the ventrals, length of base less than the 

 distance from the caudal, hind angle acutely produced. Ventrals about equal 

 to the second dorsal, ends of the fins below the hinder part of the base of the 

 latter. Caudal short, in length about twice the greatest depth, terminal portion 

 rounded, subcaudal separated from the terminal by a shallow notch, lobe weak, 

 broadly rounded. Scales minute, tricarinate. 



Uniform black. 



Type an adult female of twenty-seven inches taken off Enoshima, Japan, 

 in 345 fathoms, by the Challenger Expedition. 



