146 



MANUAL OF ZOOLOGY 



the surface of the extremity is sometimes abundantly 

 provided with stinging-capsules ; sometimes it is beset with 

 glandular adhesive papilla:. The proboscis is capable of 



long.ne 



Fig. 79. — Diagram of the organs of a Nemertine, from below, a, anus; or, brain; 

 div, caeca; long, uc, longitudinal nerve-cords; m t mouth; «, nephridia; ov, 

 ovaries; pr, probosis. (After Hubrecht.) 



being retracted within the interior of an investing sheath, 

 the proboscis sheath. 



