282 DISCOVERY REPORTS 



Sixth limb. A low unbifurcate bud without or with a small gill bud. 



Seventh limb. A strong gill bud. 



The lateral protuberances of the first abdominal somite which appeared in the pre- 

 vious stage have developed into strong outstanding wings. The base of each lies obliquely 

 on the tergum in a postero-ventral direction. These structures persist to the adult stage 

 when their anterior ends overlap the margins of the postero-lateral wings of the 

 carapace. 



Each of the third to fifth abdominal somites has a posterior dorsal spine, the fifth 

 the strongest, the third the weakest. 



The telson is similar to that of the previous stage. 



Furcilia, stage III (Fig. 38 d, e,f) 



Description based on the examination of ten specimens. Seventy-eight were measured and were 

 b-^-l"] mm. long. 



In this stage there are five pairs of setose pleopods, but the antennal endopod is 

 unsegmented. 



The frontal plate is a little more reduced, the rostral spine a little stronger than in the 

 previous stage. The spine reaches nearly as far, or as far, forward as the end of the basal 

 segment of the antennular peduncle. The carapace has a strong dorsal organ ; no trace 

 of the median posterior projection of earlier stages remains : there is a deep depression 

 in the margin in that region between the postero-lateral wings. 



The antennular spine is as long as the sum of the second and third peduncular seg- 

 ments ; the flagella are segmenting. 



The mandibular palp is unsegmented. 



The degree of development of the thoracic limbs is as follows : 



First limb. Endopod as long as to knee of that of second limb, rarely of two segments, 

 usually with three or more segments indicated. No gill bud. 



Second limb. Endopod long and kneed. Gill either of two nearly equal branches, or 

 of two nearly equal and a third smaller branch. 



Third limb. Endopod shorter than that of second but kneed. Gill as in second limb. 



Fourth limb. Endopod of five segments, not kneed or feebly kneed. Gill usually of 

 two branches, rarely with a third smaller branch. 



Fifth limb. Bifurcate. Endopod setose, not segmented or with segmentation in- 

 dicated. Gill usually of two branches, rarely with a third smaller branch. 



Sixth limb. Bifurcating or bifurcate, non-setose. A large gill bud budding off one or 

 two small branches. 



Seventh limb. A gill of two nearly equal branches and one or two smaller branches. 



Eighth limb. A small gill bud which may be branching. 



The tergal wings of the first abdominal somite may be unconnected, or they may be 

 joined dorsally by a ridge of chitin or by an upstanding "collar" as in E. valleiitini. 



