542 THE ANATOMY OP INVERTEBRATED ANIMALS. 



Thus far, although the organization of Sagitta is very- 

 peculiar, it presents analogies both with the Nematoidea and 

 with the Annelida. But its development, as described by 



»f 



¥\Q>.\^i,— Sagitta Mpunctata.—a, the head, with its eyes and appendages; J, the 

 anua ; c, the ovary ; o?, the testicular chambers. 



Kowalewsky,* is, in some respects, unlike anything at pres- 

 ent known in either of these groups. Yelk-division takes 

 place as usual, and converts the eggs into a vesicular morula, 



1 " Memoires de rAcadcraic Impcriale des Sciences dc St.-P<Stcrsbourg,' 



