60 



HISTORY OF CRUSTACEA. 



Chap. VII. 



ratus of trabeculae 

 are always distinct- 

 ly recognisable. 



During this Zoeal 

 period the paired 

 eyes, the segments 

 of the middle-body 

 and abdomen, the 

 posterior maxilli- 

 pedes, the lateral 

 caudal appendages 

 and the stump-like 

 rudiments of the 

 feet of the middle- 

 body are formed 

 (fig.30). The caudal 

 appendages sprout 

 forth like other 

 limbs freely on the 

 ventral surface, 

 whilst in other 

 Prawns, the Porcel- 

 lanw, &G., they are 

 produced in the in- 

 terior of the spatuli- 

 form caudal j)late. 



As the feet of the 

 middle-body come 



» Fig. 30. Older Zoea 

 of the same Prawn, magn. 

 45 diam. 



