APRIONODON BREVIPINNA. 117 



above the inner extremity of the pectoral, length equal height or two fifths of the 

 distance between the dorsal bases, hind margin deeply concave, hinder angle 

 acuminate, not quite reaching a vertical from (lie origin of the ventrals. Ventrals 

 small, outer angles rounded, hinder blunted. Second dorsal small, hinder angle 

 much produced; base equal half its distance from the caudal, middle above the 

 end of the anal base. Anal twice as large as second dorsal, length of base nearly 

 half the distance between it and the bases of the ventrals. Caudal more than 

 one fourth of the total length, sharp at the end ; subcaudal lobe rather acute. 



Light ashy or yellowish brown, whitish on the hinder edges of pectorals and 

 subcaudal; lower surfaces whitish. 



Total length 32s, snout to abdominal pores I65, snout to fifth gill opening 

 l\, snout to mouth 2§, and length of caudal 82 inches. 



Specimen described from Zanzibar, collected by the late Caleb Cooke. 



Aprionodon. 



Aprimt Muller & Henle, 1841, Plagios., p. 31 (preoccupied). 



Aprionodon Gill, 1861, Proc. Acad. nat. sci., Phil., p.59 extra (name only); 1861, Ann. N. Y. lye, 7, 411. 



General features of form, shapes and positions of fins, etc., like those of 

 species of Carcharinus, but differing somewhat in dentition. The teeth are 

 compressed; they are unserrated on the edges of the rather narrow nearly erect 

 cusps; the bases are broad. Fossil species occur in the Lower Tertiary. 



Red Sea, Indian Ocean and Archipelago; Western Atlantic. 



Snout elongate, tapering- 

 second dorsal smaller than anal, origin farther back 

 origin of first dorsal above inner angle of pectoral 



brevi pinna (page 117) 

 Snout short, broad 



second dorsal larger than anal, origin little farther forward 

 origin of first dorsal little back of inner angle of pectoral 



acutidens (page 118) 

 second dorsal nearly equal anal, origin at end of anal base 

 origin of first dorsal nearly above inner angle of pectoral 



isodon (page 119) 



Aprionodon brevipinna. 



Carcharias (Aprion) brevipinna MUllerA Henle, 1841, Plagios., p. 31, pi. 9; Bleekek, 1852, Plagioa., 

 p. 25. 



Carcharias (Prionodon) brevipinna Bleekeb, 1853, Nat. tijds. Ned. Ind., 4, p. 509 



