CHAP. VII. 



DEVELOPMENT OF PKAWNS. 



63 



\ 



of the middle-body, and these are biramose on the three 

 anterior segments, and simple, the inner branch being 

 deficient, on the fourth 

 segment. On the inner 

 branches the chelss are 

 developed ; the outer 

 branches are lost before 

 an inner branch has 

 made its appearance on 

 the fourth segment (fig. 

 32). The latter again 

 becomes destitute of ap- 

 pendages, so that in this 

 case at an early period 

 four, and at a later only 

 three, segments of the 

 middle-body bear limbs. 

 The fifth segment is still 

 entirely wanting, whilst 

 all the abdominal seg- 

 ments have also acquired 

 limbs, and this one after the other, from before back- 

 wards. The adult animal, as shown by the three pairs 

 of chelae, will certainly be very nearly allied to the 

 preceding species. 17 



16 Fig. 32. Youngest (observed) Zoea of another Prawn. The 

 minute buds of the third pair of maxillipedes are visible. The forma- 

 tion of the abdominal segments has commenced. Paired eyes still 

 wanting. Magn. 45 diam. 



17 The oldest observed larvae (see fig. 33) are characterised by the 

 extraordinary length of the flagella of the outer antennae, and in this 



Fig. 32.16 



