6S HISTOEY OF CKUSTACEA. Chap. VII. 



is still present, the anterior antennae are already bira- 

 mose, whilst the flagellum is wanting in the posterior, and 

 the mandibles are destitute of palpi ; the four anterior 

 abdominal segments bear biramose natatory feet, with- 

 out branchiae; the fifth abdominal segment has no 

 appendages, and this is also the case with the tail, which 

 still appears as a simple lamina, fringed on the hinder 

 margin with numerous short teeth. It is evident that 

 tlie larva stands essentially in the grade of Zoea. 



