SCYMNODON. 207 



teeth erect, small, short, with triangular cusps, in three groups; lower teeth 

 broader, oblique, not serrate. Spiracles large. Fins rather small, angles 

 hardly produced. Dorsal spines slightly exposed, anterior spine near the pec- 

 torals, posterior near the caudal. Scales uniform, with slender vertical peduncle 

 and broad, rounded, pluricarinate crown. 



Centroselachus crepidater. 



Centrophorus crepidater Bocage & Capello, 1864, Diag. fam. Squal., p. 3; Proc. Zool. soc. London, 

 p. 262, f. 3; 1866, Plagios.,p.27, pl.2,f. 2; Capello, 1870, Jor. Acad. sci. Lisboa, 2, p. 144; GcIxth., 

 1870, Cat. fishes Brit, mus., 8, p. 421; Goode & Bean, 1896, Mem. M. C. Z., 22, p. 13. 



Centroscymnus crepidater Regan, 1908, Ann. mag. nat. hist., ser. 8, 2, p. 50. 



Body moderately elongate, subround, cavity long, tail short. Snout broad, 

 depressed; nostrils oblique, nearer to the end than to the mouth. Mouth wide, 

 arched forward, with deep grooves at the angles; labial folds produced forward 

 toward the middle. Teeth unlike, not serrate: upper small, narrow, short, tri- 

 angular, nearly erect, in a median and two lateral groups; lower broader, com- 

 pressed, oblique. Spiracles large, behind the eye. Gill openings narrow, in 

 front of the pectoral. All fins small; dorsals nearly equal, spines with short 

 apex exposed, spine of the first about midway from that of the second dorsal to 

 the end of the snout, spine of the second much nearer to the extremity of the 

 caudal than to the base of the first dorsal. Pectorals short, rounded, reaching 

 nearly to a vertical from the origin of the dorsal. Origin of second dorsal above 

 middle of bases of ventrals. Ends of ventrals below end of base of second dorsal. 

 Caudal short, with feeble subcaudal lobe, and a shallow notch between the sub- 

 caudal and the terminal portions. Scales rather large, peduncle slender, erect, 

 below the middle of the flattish, rounded crown which is roughened by five to 

 seven divergent keels. Adult at less than three feet in length. 



Dark rusty brown. 



From deep waters off the coasts of Portugal. 



SCYMNODON. 



Scymnodon Bocage & Capello, 1864, Diag. fam. Squal., p. 3; Proc. Zool. soc. London, p. 263. 

 Zameus Jord. & Fowler, 1903, Proc. U. S. nat. mus., 26, p. 632. 



Body slightly triangular in a cross section. Head flattened on the crown, 

 wide posteriorly. Nostrils below the snout, far forward, oblique. Spiracles 

 large, behind the eyes and at a somewhat higher level. Mouth large, arched 

 forward, with a deep straight groove at each angle and with labial folds. 



