60 



HISTORY OF CRUSTACEA. 



CHAP. VII. 



Fig. 30." 



ratus of trabeculse 

 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, &c., they are 

 produced in the in- 

 terior of the spatuli- 

 form caudal plate. 



As the feet of the 

 middle-body come 



14 Fig. 30. Older Zoea 

 of the same Prawn, magn. 

 45 diam. 



