182 GING LYMODI.—PLEUROTREMATA. 
Lepidosteus tristoechus, Jord. & Fiverm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 111°; Meek, Publ. 
Columbian Mus., Zool. v. 1904, p. 6°. 
Length of head 3 to 31 in the length of the fish. Snout 1} to 12 as long as the rest of the head. Dorsal 7-8. 
Anal 7-8. 58 to 60 scales in a longitudinal series. 
Hab. Southern United States 224; North-eastern Mexico 224; Cubal22, 
In Mexico recorded from Tampico in Tamaulipas. 
Here described from three specimens, 300 to 500 mm. in total length, from Mexico 
and Cuba. The species is said to attain a length of 3600 mm. 
3. Lepidosteus tropicus. 
Atractosteus tropicus, Gill, Proc. Ac. Philad. 1863, p. 172*; Duméril, Hist. Nat. Poiss. ii. p. 367 
(1870) °. | 
Atractosteus bocourti, Duméril, t. c. t. 22. fig. 1°. 
Lepidosteus tropicus, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 111*; Everm. & 
Goldsborough, Bull. U.S. Fish. Comm. xxi. 1902, p. 139°; Meek, Publ. Columbian Mus., 
Zool. vii. 1907, p. 104°. | 
Length of head 32 to 32 in the length of the fish. Snout 14 to 12 as long as the rest of the head. Dorsal 
6-7. Anal 6-7. 51 to 54 scales in a longitudinal series. 
fab. Muxico, Montecristo and Teapa in Tabasco®; GuaremaLta, Huamuchal (Salvin) 
and Rio Nagualate?*; Nicaragua, Lakes Managua and Nicaragua®; Panama, 
Here described from two specimens, 450 and 500 mm. in total length. 
Sub-class I]. SELACHII. 
Order [. EUSELACHII. 
Sub-order I. PLEUROTREMATA. 
Sharks, with the gill-openings lateral, 5 to 7 in number on each side, the last in 
front of or above the pectoral fin. 
Fam. 1. CARCHARIIDA. 
1. CARCHARIAS, Rafin., 1810. 
Carcharias, Gimth. Cat. Fish. viii. p. 357 (1870). 
Carcharinus (Blainv., 1816), Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 33. 
Numerous species from tropical and sub-tropical seas. 
