SYNCARIDA. 



461 



6th segment of the limb) and a strong many-jointed swimming 

 exopodite (Fig. 287). The coxopodite bears on its outer surface 

 two flattened ovate branchial epipodites which project forwards 

 above the bases of the legs. 



Before the discovery of this form Claus had arrived at the conclusion 

 that the oostegites of the " Peracarida," and the branchiae of Amphipoda 

 were both to be regarded as epipodial structures, which have taken up 

 a position internal to the bases of the limbs. In Anaspides we now meet 

 with them in the unmodified condition, and both serving as branchiae. 



en' 



ex. 



FIG. 287. The first and second, left, thoracic limbs of Anaspides. A maxilliped ; B first 

 walking leg ; en endite ; ep epipodites ; ex exopodite (after Caiman). 



The first thoracic appendages (Fig. 287 A), though formed in 

 most respects on the same type as the others, possess two gnatho- 

 basic lobes on the inner side of the coxopodite, and have thus, 

 to this extent, the character of maxillipeds. The exopodite is 

 also much reduced. In the 8th both exopodite and epipodites 

 are wanting. 



The abdomen is powerfully developed and the exopodites of 

 the pleopods are strong, many-jointed rami, though the endo- 

 podites are reduced to small rounded lobes. The endopodites 

 of the two anterior pleopods of the male are however modified 

 as copulatory organs after the manner of those of Decapods. 

 The uropods are broad flattened appendages and form, with the 

 telson, a powerful caudal fin. 



Our knowledge of the internal anatomy is far from complete. A 

 true median eye has not been recognized. There is median group 



