THE BRANCHIOPODA 



In |the former the appendages of the genital somite (the eleventh 

 trunk-somite) are modified to form brood-pouches, and are known 

 as " oostegopods " (Fig. 25). The sixth endite is coalesced with 



A. 



FIG. 24. 



Trunk-limbs of Cladoeera. A, first trunk-limb of Sida crustallma (CtenojKxla). B, first, 

 C, second. L), third, E, fifth trunk-limbs of Daphnm pulex (Anomopoda). br, brancliia ; gn, 

 gnathoba.se. (After Lilljeborg.) 



the sub-apical lobe, and together with it forms a hemispherical 

 cup, closed by a movable lid formed by the flabellum. In some 

 species of Conchostraca two or three pairs of limbs near the genital 

 apertures have the proximal division of the flabellum produced 



