118 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Spiracle moderate. Skin with minute scales. First dorsal above 

 body cavity, before ventrals. Second dorsal larger than anal. Anal 

 present. Caudal moderate, without pits and low subcaudal lobe not 

 prominent. Paired fins moderate. 



A family of large sharks, found in deep water. They are dis- 

 tinguished chiefly by the long, low, first dorsal. 



Genus PSEUDOTRIAKIS Capello 



Pseudoiriakis Capello, Joru. Sci. Math. Plays. Nat. Lisboa, vol. 1, p. 321, 1868. 



(Type, Pseudoiriakis microdon Capello, monotypic.) 

 Pseudotriacis GIjntheb, Cat. Fishes British Mus., vol. 8, p. 395, 1870. (Type, 



Pscudotriakis microdon Capello.) (Emeudation.) 



Body elongated. Snout short, tapering, end blunt. Eyes oblong. 

 Mouth with short labial folds around angles on both jaws. Teeth 

 with strong median cusp and small lateral cusps. Nostrils near 

 mouth. Spiracle behind eye. First dorsal longer than second, long, 

 low, gradually elevated posteriorly. Second dorsal behind ventrals, 

 opposite and like anal. Anal below second dorsal and smaller. 

 Pectoral short, wide. 



PSEUDOTRIAKIS MICRODON Capello 



Pseudotriakis microdon Capello, Jorn. Sci. Math. Phys. Nat. Lisboa, vol. 1, pp. 

 315, 321, pi. 5, fig. 1, 1868 (type locality: Setubal, Portugal ) .—T. H. Bean, 

 Proc. U. S. Nat. Mus., vol. 6, p. 147, 1883 (Amagansett, Long Island).— 

 GooDE and Bean, Oceanic ichthyology, p. 18, pi. 5, fig. 17, 1895 (Long Island 

 example). — Gabman, Mem. Mus. Comp. Zool., vol. 36, p. 104, 1913 (Portugal 

 and New York ) .— Fowlee, Proc. 4th (1929) Pacific Sci. Congr., Java, p. 489, 

 1930 (Japan; Atlantic). 



Pseudotriacis microdon Gunther, Cat. Fishes British Mus., vol. 8, p. 395, 1870 

 (copied). — Regan, Ann. Mag. Nat. Hist., ser. 8, vol. 1, p. 464, 1908 

 (Portugal). 



Pseudotriakis acralcs Jordan and Snyder, Smithsonian Misc. Coll., vol. 45, p. 

 232, pi. 62, 1904 (type locality: Suruga Bay, Japan). 



Pseudotriacis acralcs Regan, Ann. Mag. Nat. Hist., ser. 8, vol. 1, p. 465, 1908 

 (note). 



Pseudotriakis acrages Garman, Mem. Mus. Comp. Zool., vol. 36, p. 104, 1913 

 (Pacific near Japan). — Jordan and Hubbs, Mem. Carnegie Mus., vol. 10, p. 

 102, 1925 (note). 



Depth 614 to subcaudal; head 4I/5. Snout 2% in head; eye 6, 

 214 in snout ; deep fold below eye ; mouth gape 2I/2 in head ; preoral 

 length 3; teeth in oblique rows, upper widely spaced posteriorly, 

 edges serrated; intemarial 4l^ in head; interorbital 2%, low. Gill 

 rakers equidistant, subequal. Spiracle less than eye diameter behind 

 eye. 



Scales minute, leaflike prickles, each with strong, elevated midrib. 



Second dorsal higher than first, fin length lyV in head ; anal length 

 11/4; least depth of caudal peduncle 4; pectoral 1%, width 1% its 



