DEVELOPMENT OF EUPHAUSIA SUPERB A 65 



In the larvae having a two-spined telson there are only two records of the number 

 of segments in the antennal inner ramus; the number in each is 2-^3. The one-spined 

 larvae have antennae segmented as follows : 



The length distribution of all larvae having segmented antennae, grouped according 

 to the number of segments in the antenna, is given in Table XXVI. 



Table XXVI. Length frequency of Fur cilia larvae with segmented antennae 

 arranged according to the number of antennal segments 



This arrangement of results shows that, although there is a narrow range of larval 

 length, namely \ mm., in which it is possible to find any one of the five different forms 

 of segmentation distinguished, the average lengths of the larvae clearly increase with the 

 increasing development of this appendage. Incidentally the relative scarcity of the 

 antennal form 2+2 suggests that the normal process of segmentation of the antennal 

 endopod oi Etiphausia superba is as follows: i, 1+1,2+1,2+3. 



Mandibular palp. In this appendage the number of segments and the number of 

 spines on the terminal segment were noted. 



The change of the mandible from its primitive form takes place entirely within the 



