tt EXPLANATION OF ANATOMICAL PLATES. 



VI. GENERATIVE APPARATUS — PLATE E. 

 Fig. 8. Generatlro organs of Athalia centifolia : aa, ovarial tubes ; cc, uterine cavities ; d, separate 



OTiducta ; e, ejaculatory oviduct ; /, spcrmathcca ; g, poison gland ; h, its vessel ; 10, 11, 



terminal ganglia. 

 Fig. 7. 6«n«rativo organs of Ranatra linearis : the letters correspond to the same parts as in fig. 8 ; 



g, supposed swimming bladder, with part of the intestine. 

 Fig. 6. Male organs of Athalia centifolia : aa, smaller testes ; bb, ducts ; c, larger testis ; dd, vasa 



defcrentia ; e, vesicula seminales ; h, ejaculatory duct ; i, exterior valves. 

 Fig. 9. Hydrus piceus : aa, testes ; bb, vasa defcrentia ; cc, principal seminal vessels ; eeee, various 



accessory vessels ; /, ejaculatory duct ; g, copulative armature of the vagina. 

 Fig. 4. Testicles of Silpka obsaira, greatly magnified. 



