Chap. VII. 



DEVELOPMENT OF PEAWNS. 



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 chelse 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.^^ 



Fig. 32. 



^6 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. 



^7 The oldest observed larvae (see fig. 33) are characterised by the 

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



