78 FISHES OF NEW ZEALAND. 



Carcharodon. 



Second dorsal and anal very small ; a pit at the root of the caudal, 

 which has the lower lobe well developed ; side of the tail with a keel ; 

 spii-acles minute ; teeth large, flat, erect, triangular, serrated. 



Temperate and tropical seas. 



125. CARCHARODON RONDELETII. Mull. CM. 



■White Shark. 

 CarcJuirias Maoo, Cat. Col. Mus. C. rondeletii, Giinth., VIII., 392. 



The third tooth on each side of the upper jaw is conspicuously smaller 

 than the second and fourth ; teeth ^ on each side ; the second dorsal fin 

 in advance of the anal (Giinth.) 



A pair of jaws, 20 inches in the gape, of this species is in the 

 Colonial Museum; the teeth in the upper jaw are 1-3 inch in length 

 and ri inch in breadth at the base, not including the root. 



From the Mediterranean to Australia. 



Alopecias. 



Caudal of extraordinary length, with a pit at its root ; the second 

 dorsal and anal very small ; spii"acles minute, behind the eye ; teeth 

 equal in both jaws, of moderate size, flat, triangular, not serrated. 



Temperate and tropical seas. 



126. ALOPECIAS VULPES. Gml. CM. 



Thresher. 

 A. vulpes, Giinth., VIII., 393. 

 The third tooth on each side of the upper jaw much smaller than the 

 others ; pectorals large, falciform. 



This species is represented in the Colonial Museum by two 

 photographs of a specimen obtained in Blind Bay. 

 Mediterranean, Atlantic, Cape of Good Hope. 



NOTIDANID^. 



Characters of the single genus. 



ISTOTIDANUS, 



One dorsal fin only, without spine, opposite to the anal ; no pit at 

 the root of the caudal fin ; no nictitating membrane ; spiracles small, on 

 the side of the neck ; no labial fold ; mouth crescent-shaped ; dentition 



