284 DISCOVERY REPORTS 



The antennular spine is a little shorter than the sum of the second and third segments 

 of the peduncle. 



The mandibular palp is usually of three segments and setose. 



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



First limb. Endopod of five segments, long and kneed, reaching well beyond knee of 

 second. 



Fifth limb. Endopod shorter than those of anterior limbs but kneed. 



Sixth limb. Endopod of five segments but not kneed. 



The development of the gills is as follows : 



First gill. A small bud. 



Second to fifth gills. Of three equal branches without or with another smaller branch. 



Sixth gill. Of three larger branches and buds of others, or of four larger branches 

 with or without the buds of others. 



Seventh gill. Of four or five larger branches with the buds of others. 



Eighth gill. Of two, three or more, usually four, larger branches and the buds of 

 others. 



The end of the telson is narrower, the innermost of the postero-lateral spines thicker, 

 than in the previous stage. The latter have lost the spinules of their inner margins. 



Fiircilia, stage VI 

 Description based on the examination of nine specimens, 8-8-1 17 mm. long. 



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



The frontal plate is a little reduced compared with that of the previous stage, the 

 rostrum is as long. The dorsal organ may not be very distinct from the strong arched 

 crest which runs forward from it to the rostrum. 



The antennular spine is nearly as long as, or much shorter than, the sum of the 

 second and third segments of the peduncle. The mandibular palp is segmented and 

 setose. 



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



First limb. Endopod shorter than that of second. 



Fifth limb. Endopod kneed, much shorter than, to nearly as long as, that of fourth. 



Sixth limb. Endopod much shorter than that of fifth but kneed. 



The gills of five specimens were examined ; in four they were as follows : 



First gill. A small or large simple bud. 



Second to fifth gills. Of three equal branches and a fourth smaller branch. 

 Sixth gill. Of four or five equal branches with buds of others. 

 Seventh gill. Of six roughly equal branches with buds of others. 

 Eighth gill. Of four, five or six roughly equal branches and buds of others. 

 In the fifth specimen, the smallest one seen, only 8-8 mm. long, the gills were less 

 developed, corresponding most nearly with those of stage IV. 



