﻿gill] 



LIFE HISTORY OP MM ANGLES 



The newly hatched young, as Agassiz well says, "it would be 

 difficult to recognize" as the embryo of the angler. It would, in- 

 deed, be impossible to do so 

 without extraneous infoi 

 tion. It is an elongated, 

 mouthless and almost shapeless 

 being with tin- yolk' still form- 

 ing nearly half its bulk and 

 with simply a continuous I'm 

 fold. 



About a week later it has ob- 

 tained a month, a dorsal ray has been evolved, and long spatula-like 

 ventrals as well as short broad pectorals have been developed. 



I'n,. ')S. Young angler not long after 

 hatching ; the yolkl ' irely dis- 



ced, i \Mi r A. Agassiz. ) 



Fig. 99. — Young angler with 2 elongated dorsal rays and rudiment of third, anil 

 2 large ventral rays. (After A. Agassiz.) 



In about a fortnight or little more a second dorsal ray lias become 

 manifest, the pectorals have developed incipient rays, and the ventrals 

 show two rays. 



At a considerably later period the early form is still retained but 

 the head is more pronounced, the mouth and jaws better defined, and 



p IG I00 , — Young angler showing still greater increase in length and number of 

 anterior dorsal and ventral rays. (After A. Agassiz.) 



the four distinct dorsal rays over and behind the head are manifest : 

 the two ventral rays have become longer. There is an indication in 



