64 DISCOVERY REPORTS 



spined larvae are given in Table XXIV. With the exception of the first, the larvae show a 

 direct relation between size and number of segments. 

 Table XXIV. Larvae zvith segmented antefinae and five terminal spines on the telson 



There are only three four-spined larvae in which the antennal condition is recorded ; 

 of these the two smaller have a two-segmented antenna and the remaining rather larger 

 one three segments. 



The relation is most clearly demonstrated in the larvae having three terminal telson 

 spines. In this group there are forty-seven larvae having antennal inner rami varying 

 in development between that which is unsegmented and that in which the inner ramus 

 is composed of two peduncular and more than three flagellar segments. In Table XXV 

 these larvae are set out according to total length and the number of segments in the 

 inner ramus of the antenna. The average length of each group of larvae having the same 

 number of antennal segments is stated. The increase in the number of segments in the 

 antennal endopod varies directly with increase in average length; but as in the size 

 ranges of larvae with unmodified and modified antennae, so here in the number of seg- 

 ments, the size range for any one number of segments overlaps in its lower and upper 

 limits the ranges which precede and succeed it. 



Table XXV. Larvae with three-spined telson. Length frequency and 

 condition of the antennal endopod 



