% 



Fig. 44. — A Nemertime — Tetrastemma. 

 Actual length about i h inch. 



Fig. 45. — Diagram of Nemertine — 

 Nemertopsis. 



c^" and so-, Sense organ ; a, eyes ; j^/i, brain ; 

 /V, blood vessels ; n, nerve cord ; c/, ali- 

 mentary canal ; t\v, nephridia ; r, snout, 

 withdrawn. 



