FIG. 44. A Nemertime Tetrastemma. 

 Actual length about 1 1- inch. 



FIG. 45. Diagram of Nemertine 

 Nemertopsis. 



eg and sg, Sense organ ; a, eyes ; gh, brain ; 

 hi, blood vessels; ;/, nerve cord; d, ali- 

 mentary canal ; ex, nephridia ; r, snout, 

 withdrawn. 



