118 THE PLAGIOSTOMIA. 



Carchai'ias (Api-ionodon) hrevipinna Gill, 1861, Ann. N. Y. lye, 7, p. 411 (name only); Dttm^ril, 

 1865, Elasm., p. 348; Gunth., 1870, Cat. fishes Brit, mns., 8, p. 361. 



Body moderate, fins rather small. Head depressed, nearly one fourth of 

 the total length, tapering to the bluntly rounded end of the snout. Snout pro- 

 duced, narrowed forward, preoral length equal distance from eye to gill opening. 

 Length of orbit little greater than width of nostril, nearly equal width of gill 

 opening; nasal valve without a pointed lobe. Mouth large, broadly arched, 

 labial folds in the angles only. Teeth small, in || rows, not serrated; bases 

 broad, without denticulation ; cusps narrow, upper erect or nearly so, median 

 small, median lower small with a row of small teeth at each side of it. Pectorals 

 subfalciform, hind margin somewhat indented, angles blunted, outer angle 

 reaching the end of the base of the dorsal. Origin of dorsal above the inner 

 angle of the pectoral; base about one length forward of the bases of the ventrals, 

 length less than half its distance from the second dorsal. Anal little smaller 

 than the ventrals, larger than the second dorsal and origin farther forward, hind 

 margin much indented, hind angle produced and reaching half way from the 

 base to the caudal. Second dorsal small, above the anal but origin a trifle 

 farther back, base distant twice its length from the caudal pit. Caudal about 

 one fourth of the total length, pointed, subcaudal lobe produced, sharp. 



Java. 



Aprionodon acutidens. 



Carcharias acutidens Rxjppell, 1835, Neue wirb. Abyssinien, Fiache, p. 65, pi. 18, f. 3; Klunzinger, 

 1871, Syn. fische, 2, p. 217; Day, 1878, Ind. fishes, p. 713; GtJNTH., 1910, Sudsee fische, 3, p. 478. 



Carcharias (Aprionodon) acutidens Dum^ril, 1865, Elasm., p. 349; GtJNTH., 1870, Cat. fishes Brit, mus., 

 8, p. 361. 



Head less than one fourth of the total length, broad, depressed, with sides 

 curving from behind the eyes to the end of the snout. Snout short, length little 

 more than that of the mouth, much less than the width of the latter. Nostrils 

 about opposite the middle of the preoral space, nearer to the eye than to the end 

 of the snout, with prominent inner valves. Eye small, much nearer to the end of 

 the snout than to the first gill opening. Width of mouth equal twice its length. 

 Labial folds short, upper directed outward and a little forward, lower hidden in 

 the angle. Teeth in 27-29, fg, rows, not serrated, with broad bases and lanceo- 

 late, narrow, erect cusps, upper with a shallow notch at side on the base. Gill 

 openings wide, width more than twice the length of orbit. Pectorals large, 

 width about four fifths of the greatest length, outer angle sharp, hind margin 

 concave, fin very little falciform. Origin of first dorsal little behind the inner 



