ii6 COMPARATIVE ANATOMY 



resemble modified limbs, and are reckoned as such by some 



Fig- 25 



A. Ventral view of the male, and £, ventral view of the female 

 crayfish. The thoracic limbs of one side are removed, as also 

 the ova from the right side of the abdomen of the female. /, 

 the first antennee ; //, the second antennae ; V/l, the second 

 maxillipeds ; VIII, the third maxilHpeds ; IX, the chelas ; 

 X-XIII, the four pairs of pareiopods ; XIV-XIX, the six ab- 

 dominal segments with their appendages; 2", the telson ; J" 



male generative aperture ; p female generative aperture ; 



an, anus ; ex, opening of the green gland on the basal joint of 

 the second antennas; r, rudimentary first abdominal limb of 

 the female ; st, sternum ; ov, ova, carried on the abdominal 

 limbs of the female ; ex.p, exopodite, and en.p, endopodite of the 

 last pair of abdominal limbs. 



authors, including Huxley. But we shall not adopt this view, 



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