292 DISCOVERY REPORTS 



Fifth limb. Endopod of five segments and not kneed. Gill of two equal branches. 



Sixth limb. Very short, bifurcating, non-setose. Gill budding off a second branch. 



Seventh limb. A gill of two large and two small branches. 



Eighth limb. A very small gill bud, single or branching. 



The spine from the third abdominal somite varies from being over half the length of 

 the fourth somite to being, more frequently, as long as it. The innermost pair of postero- 

 lateral spines are thicker and longer than in the previous stage ; each has a row of strong 

 spines along the distal half of the inner margin (Fig. 39 /). 



Furcilia, stage VI 

 Description based on the examination of four specimens, 77-8-3 mm. long. 



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



In three specimens the dorsal organ is high and abrupt, in one a low crest. The frontal 

 plate and rostral spine are similar to those of the previous stage except that in one 

 specimen the rostral spine is very short; it appears malformed. The posterior projection 

 of the carapace varies from reaching nearly to the end of, to reaching less than halfway 

 down, the second abdominal somite. 



The antennular spine is as long as, or shorter than, the sum of the second and third 

 segments of the peduncle. The beginnings of the lappet of the first segment and of the 

 carina of the third may be present. The mandibular palp is unsegmented and non-setose 

 in one of the specimens, 7-9 mm. long, but of three segments and setose in the other 

 three, 8-o, 8-2 and 8-3 mm. long. 



The thoracic limbs of a specimen 8-3 mm. long are as follows: 



First limb. Endopod considerably longer than to knee of second, weakly kneed. No 

 gill bud. 



Second and third limbs. Gills of three roughly equal branches. 



Fourth limb. Endopod long and kneed. Gill of three roughly equal branches. 



Fifth limb. Endopod long and kneed. Gill of three branches, two large and one 

 small. 



Sixth limb. Endopod short, of five segments and weakly kneed. Gill of three equal 

 branches and a number of small buds. 



Seventh limb. Gill of four branches and a number of small buds. 



Eighth limb. Gill of two small and three smaller branches. 



The tergal wings of the first abdominal somite are changing their shape to approach 

 that of the adult ; the free edge has a well-defined angle dorso-anteriorly, a poorly defined 

 angle ventrally. The spine of the third somite is nearly as long, or as long, as the fourth 

 somite. The telson is narrower than in the previous stage; an additional pair of lateral 

 spines has appeared between the pair present in earlier stages and the postero-lateral 

 spines. The middlemost pair of the latter is becoming reduced. 



