194 THE PLAGIOSTOMIA. 



Young with lighter margins on the fins. 



Specimen described, from Havre, France, in total length 27, snout to ab- 

 dominal pores 15, snout to first dorsal 82, snout to pectoral 5|, snout to mouth 

 22, and caudal 5| inches. 



Figured from the New England Coast, Plate 14, fig. 1-4. 



Squalus sucklii. 



Acanthias vulgaris Schleqel, 1850, Jap. Pisces, p. 304, pi. 135 (non Risso). 



Spinax (Acanthias) sucklii Girard, 1854, Proc. Acad. nat. sci. Phil., p. 196. 



Acanthias sucklii Girard, 1858, Rept. Pacif. R. R. Fish., p. 368. 



Squalus sucklii Gill, 1862, Proc. Acad. nat. sci. Phil., p. 499; Jord. & Everm., 1S96, Bull. 47, U. S. nat. 



mus., p. 54. 

 Squalus milsukurii Jord. & Snyder, 1901, Check list, p. 129; Jord. & Fowler, 1903, Proc. U. S. nat. 



mus., 26, p. 629, f. 3; Gilbert, 1905, Bull. U. S. fish, comm., 23, p. 5S0; Regan, 1908, Ann. & mag. 



nat. hist., ser. 8, 2, p. 47. 

 Squalus japonicus Ishikawa, 1908, Proc. Acad. nat. sci. Phil., 60, p. 71. 

 Acanthias mitsukurii Gunther, 1910, Siidsee fische, 3, p. 490. 



Snout little broader than that of S. acanthias, blunted at the end; nostrils 

 transverse, midway from the mouth to the end, anterior valve short, with outer 

 angle produced and an indentation or notch in the middle of the hind edge in 

 which there is a rudimentary median process. Eye moderate, orbital length 

 nearly half the distance from the end of the snout, to which it is nearer than to 

 the gill opening. Spiracle a little nearer to the end of the snout than to the 

 pectoral. Mouth with a deep groove and labial folds at each angle, width 

 about two thirds of the preoral length. Gill openings little more than half the 

 length of the orbit, hindmost widest, in front of the pectoral. Pectoral broader 

 than long, angles rounded, hind edge slightly concave, fin applied to the side 

 reaching below the first dorsal spine. Spine of first dorsal very little if any 

 farther back than the inner extremity of the pectoral, rather small, about half 

 the length of the front margin of the fin; base without the spine less than one 

 fourth of its distance from the second dorsal, hind edge concave, hind angle 

 produced. Base of the second dorsal less than two thirds as long as that of the 

 first, less than half of the distance from the caudal, hind margin deeply concave, 

 hind angle produced but not reaching half way to the caudal. Origin of the 

 ventrals little nearer to the caudal than to the origin of the pectoral, nearer to 

 that of the second dorsal than to that of the first dorsal. Dermal folds at the 

 side of the tail fainter below the second dorsal than farther back. Caudal with 

 a pit in front and with a well developed subcaudal lobe. Total length of speci- 

 men described 24, snout to abdominal pores 10j, snout to dorsal 8, snout to 

 pectoral 5, snout to second dorsal 14|, snout to ventral 12^, and caudal 5 inches. 



