164 THE PLAGIOSTOMIA. 



vance, hind margin of anal more deeply indented. Caudal nearly one fourth 

 of the total length; subcaudal lobe well developed, its angle rounded off. 



Dark above; lighter below. 



Kurrachee, India. 



Leptocharias. 



Leptocharias Muller & Henle, 1838, Charlesworth's mag., 2, p. 30. 

 Leptocarcharias Gunth., 1870, Cat. fishes Brit, mus., 8, p. 384. 



Trunk rather slender; head short; snout produced, rounded at the end. 

 Anterior nasal valve with an elongate lobe. A nictitating membrane. No 

 spiracles. Mouth greatly arched; labial folds well developed. Teeth equal, 

 small, numerous, with a longer median cusp and one to three smaller lateral 

 cusps at each side of it on the base. First dorsal above the space between pec- 

 torals and ventrals; second dorsal above the anal. Hindmost gill openings above 

 the bases of the pectorals. Caudal without a pit at its root ; subcaudal lobe small, 

 undeveloped. 



Leptocharias smithii. 



Triaenodon smithii Muller & Henle, 1841, Plagios., p. 5G, p. 21; Dumeril, 1865, Elasm., p. 387. 

 Leptocharias smithii Gray, 1851, Chondropterygii, p. 51. 

 Leptocharcharias smithii GUnth., 1870, Cat. fishes Brit, mus., 8, p. 384. 



Body elongate; head nearly one fifth of the entire length; length of the 

 snout hardly equal to the width of the mouth. Nostrils nearer to the mouth 

 than to the end of the snout, anterior valve with a long pointed lobe. Mouth 

 large, length about two thirds of the width; labial folds elongate. Teeth small, 

 numerous, alike in the two jaws, with a longer more or less oblique median cusp 

 which has at each side of its base one to two smaller ones; cusps decreasing 

 in size toward the angles of the mouth; median tooth of the lower jaws small, 

 erect. Pectorals triangular, outer angle produced, blunted. First dorsal mid- 

 way between pectorals and ventrals, upper angle blunt, hinder sharp, hind mar- 

 gin concave. Second dorsal little smaller than the first, above the anal with 

 nearly half of its base extending farther forward. Anal much smaller than the 

 second dorsal, base extending somewhat farther back. Ventrals little in advance 

 of the middle of the total length. Caudal rather short, subcaudal lobe not 

 prominent. 



Reddish brown, lighter below. 



Cabenda Bay, South Africa. 



