﻿HSONIAN MISCELLANEOUS COLLECTIONS 



[VOL, 47 



the lower fold of the future caudal and where the notochord is to 

 be tilted up. 



r still the continuous fold has been broken up and distinct 

 raved dorsal and anal fins are developed, but the caudal is '" hetero- 



loi. — Young angler in oldest pela measuring 30 millimeters in 



length, seen in profile. (After A. Agass 



.1." The anterior dorsal has been increased by a short ray in 

 front and another behind and all are more elongated and ray-like 

 than in earlier stages. The pectorals have become well developed 

 and the ventrals enormously elongated so that, when seen swimming 

 from above the little fish reminds us of a long- 

 led butterfly. 



When the angler has reached this stage, it 

 has become a respectable fish. It does not. 

 indeed. look at all like its mother but neverthe- 



- - an ichthyologist, perfectly familiar with the 

 fishes of the North Atlantic, would have no diffi- 

 culty in recognizing it as the young of the ang- 

 ler. The numbers of rays, and more especially 

 the six nearly or quite free anterior dorsal rays. 



characteristic and distinguish the fish from 



.- \ all others. The condition and mode of develop- 



/ ment of these free rays are indeed noteworthy 



on account of their early appearance, inasmuch 



- he anglers are not in other respects radically 

 differentiated from other families of pediculate 

 fishes. 



Development still goes on and the caudal fin 



becomes homocercal. the other fins still better 



defined. The head grows disproportionately, 



the ventral fins become much reduced and the 



pee: 5 less so, the foremost dorsal spine 



. s out beyond all the others and the second to sixth, arrested in 



dopment. are much shorter, and the four median caudal rays 



rked. A regular fully develop" the outcome. 



Fie. 10 ;. — 'S 



angler of oldest 

 pel.. 



n from a' 



'. 

 siz.) 



