484 



ZOOLOGY 



SKfT. 



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 



ov 



FIG. 370. Spirorbis lacvis, a hermaphrodite tubieolous Polychtt. Lateral view of entire 

 animil. a,>.t. neph. anterior nephridium ; br. braiichise ; ces. (esophagus; oj>. opercuhnn with 

 developing embryos in its interior ; ov. ova ; sp. sporms ; st. stomach. (After Claparede.) 



resulting embryos adhere in masses to the dorsal surface under the 

 shelter of the elytra ; in some other Polychseta 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 Crvpto- 



