DEVELOPMENT OF EUPHAUSIA SUPERB A 63 



narrow limits at all events, the size does not determine the point at which the antennae 

 should assume the segmented form ; for instance, in the five-spined group there is an 

 overlap of i mm. in the length distributions of the unsegmented and segmented forms. 

 At the same time, however, it should be noted that of the five-spined larvae which 



Table XXIII. Length frequency of Fur cilia larvae from St. 374 divided into groups 

 according to the numbers of spines on the telson and the form of the inner ramus of 

 the antenna 



are segmented the length distribution is towards the upper rather than the lower 

 length limit of the five-spined group. 



The larvae having segmented antennae show also that the degree of segmentation is 

 generally dependent on size. The lengths and number of segments in the antenna of five- 



