128 THE PLAGIOSTOMIA. 



sharp, inner blunt rounded, width about § of the greatest length reaching below 

 the middle of the dorsal. Dorsal origin above the inner angle of the pectoral, 

 fin not reaching a vertical from the origins of the ventrals by a space as long as 

 the mouth. Ventrals small, about midway between the bases of the dorsals. 

 Second dorsal small, distance from the base of the first equal n of the caudal, 

 basal length equal half its distance from the caudal pit, or about the length of 

 the produced hinder angle. Anal little larger than the second dorsal and directly 

 below it, hind margin deeply notched, with two sharp angles. Caudal about 7 

 of the total, lower lobe produced, pointed. Total length 39, snout to abdominal 

 pores 20, snout to fifth gill opening 9?, snout to mouth 3g, and caudal fin 11 

 inches. 



Back brown, with a black spot on tips of dorsals, pectorals, anal and sub- 

 caudal; below white. 



Tropical and temperate seas. Specimen described from Rio Janeiro, secured 

 by the Hassler Expedition. 



Carcharinus brachyurus. 



Carcharias {Prionodon) brachyurus Gunth., 1870, Cat. fishes Brit, nius., 8, p. 369. 



Snout moderate, rather pointed, longer than the mouth, length about two 

 thirds of the latter' s width, nostrils behind the middle but nearer to the end than 

 to the angles of the mouth. Teeth serrated; upper oblique, deeply notched on 

 the outer margin; lower erect, cusps narrow, lanceolate, bases broad, two-rooted. 

 Gill openings at least twice the width of the eye. Pectorals narrow, pointed, 

 falciform. Dorsal rather nearer to the pectorals than to the ventrals, the dis- 

 tance from the latter being little less than the length of the dorsal base. Second 

 dorsal very small, smaller than the anal. Anal origin opposite that of the second 

 dorsal, midway from ventrals to caudal. Caudal one fourth of the total length. 

 Type seven feet nine inches in length. 



Coloration uniform. 



New Zealand; Australia. 



Carcharinus amblyrhynchus. 



Carcharias (Prionodon) amblyrhynchos Bleeker, 1856, Nat. tijds. Ned. Ind., 10, p. 467; Dum6ril, 

 1865, Elasm., p. 364; GtJNTHER, 1870, Cat. fishes Brit, mus., 8, p. 368. 



"Carch. (Prion.) corpore elongato compresso, altitudine Tig circiter in ejus 

 longitudine; capite 5 circiter in longitudine corporis, duplo circiter latiore 

 quam alto; oculis diametro 82 circiter in longitudine rostri, pupilla oblonga 



