53 DISCOVERY REPORTS 



In the three-spined larvae it is more difficult to distinguish the number of spines to 

 be found in the succeeding stage, but in those in which it is possible, a succeeding one- 

 spined stage predominates. One larva has two spines in the following stage and there 

 is no sign that any are to be three-spined. 



Fig. 12. Normal and abnormal types of telson tip in Furcilia stages (x 85). 

 a, the normal seven-spined telson. b-e, abnormalities. 



In Table XX, b is referred to under Note 10, c under Note 12, (/under Note 13, e under Note 14, /under 

 Note 15. In«,i,c and/, the form of the telson in the succeeding stage can be distinguished. 



It would appear therefore that in the succession of moults which follow on the larvae 

 having five setose pairs of pleopods and the B form of telson, the ecdyses generally 

 coincide with a reduction in the number of terminal spines in the telson from seven to 



