4Si 



ZOOhOCiY 



Such a brood-pouch is formed in certain Phanerocephala by the 

 raising up of the integument on the ventral surface. In some 

 species of Polynoe and allied genera, the fertilised ova and the 



Of 



]-'](.;. 37fi.— Spirorbis Isevis, a henuaphrodite tubicoloua Polychtwt. Lateral view of entire 

 anini il. ciil, iieph. anterior iiephridiura ; br. bninchi* ; as. cesophagus ; op. operculum with 

 developing embryos in its interior ; ov. ova ; Sji. sperms ; »t, stomach. (After Claparfede.) 



resulting embryos adhere in masses to the dorsal surface under the 

 shelter of the elytra ; in some other Polychaita they are stuck by 

 means of some viscid secretion all over the dorsal surface, or 

 they may adhere singly to the ventral cirri. In certain Crypto- 



