DEVELOPMENTAL PHASES 367 



The thoracic appendages are unchanged except for the cormopods. The second is now segmented 



and geniculate. The third is bifurcate and carries rudimentary gills. The fourth is now visible as 



a simple bud bearing rudimentary gill-lobes. 



The abdomen bears four pairs of setose pleopods and one pair of non-setose. 

 The condition of the telson is unchanged. 



025mm 



Fig. 17. Euphausia tenera. a, first furcilia, lateral view; b, cephalothorax, dorsal view; c, second antenna; d, telson and 

 uropods ; e, first maxilla ; /, second maxilla ; g, first cormopod ; h, second cormopod ; /, third cormopod. 



Third furcilia. Four specimens examined and measured. Length range 5-1-5-3 mm.; average 

 length 5-2 mm. (Fig. 18c, d). 



The anterior margin of the carapace is now produced as a definite, pointed rostrum which extends 

 beyond the eyes. 



