270 DISCOVERY REPORTS 



Furcilia, stage V 



Description based on the examination of nine specimens. Thirty-six were measured and were 

 7-0-8-3 mm. long. 



In this stage there are three terminal spines on the telson. 



The carapace and frontal plate are as in the previous stage, the frontal plate being 

 most often a triangle with straight sides. 



The antennular spine is as long as, or a little shorter than, the second peduncular 

 segment. 



The mandibular palp may be either unsegmented or of two or three segments and 

 setose. 



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



First limb. Endopod of five segments and similar in shape to that of second but much 

 shorter. No gill bud. 



Third limb. Endopod nearly as long as that of second and kneed. 



Fourth limb. Endopod considerably shorter than that of third but kneed. 



Fifth limb. Endopod much shorter than that of fourth, of five segments but not 

 kneed. 



Sixth limb. From short bifurcate with endopod unsegmented but setose, to longer 

 with endopod of three segments. 



Buds of the second to eighth pairs of gills are present. The second to fifth are single, 

 the sixth to eighth beginning to branch ; or more often the second to fifth are single or 

 beginning to branch, the sixth and eighth two-branched, the seventh three-branched. 

 The new branches are in all much smaller than the buds from which they arise. 



The tergal wings are not connected dorsally by a collar. 



Furcilia, stage VI 



Description based on the examination of fifteen specimens. Sixty-two were measured and were 

 6-8-9-6 mm. long.^ 



In this stage there is one terminal spine on the telson. 



The carapace and frontal plate are similar to those in the two previous stages, the 

 frontal plate being most often a triangle with straight sides. 



The antennular spine is as long as, or a little shorter than, the second peduncular 

 segment. 



The mandibular palp is rarely not segmented nor setose, usually segmented and 

 setose. 



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



First limb. Endopod reaching well beyond knee of second. No gill bud or a very 

 small gill bud. 



Fourth limb. Endopod nearly as long as that of second. 



^ Rustad records one of only 6-o mm 



