HABITS, ETC., OP OEREBRATULUS LACTEUS. 103 



extended by Verrill, in 1892, to include the larger adults 

 which are often not at all "milky" (46). 



Habitat and Habits. 



This large Nemertean is quite common along the entire 

 Atlantic coast, from Florida to Massachusetts Bay, and is 

 found locally at Casco Bay on the coast of Maine. From 

 this latter locality were obtained all the specimens which 

 furnished data for the present paper. Verrill states (46) 

 that he found adults at Quohog Bay, one of the numerous 

 inlets of Casco Bay. These were associated with a number 

 of other southern forms, such as Venus mercenaria, 

 Crepidula convexa, Eupagurus longicarpus, Gam- 

 marus mucronatus, Nereis libata, Meckelia ingens, 

 Asterias arenicola, etc. These species properly belong 

 to the region south of Cape Cod, and it might be inferred 

 that Cerebratulus also was a southern species, and that it 

 could be found in northern waters only under specially 

 favourable conditions. 



Such, however, is not the case ; I obtained a number of 

 specimens from Quohog Bay, but found them more abundant 

 at Stover's Point on the east side of Harpswell Neck. All 

 the specimens used were obtained here, but none of the 

 southern species named above were found anywhere in the 

 vicinity. Furthermore, the Point is only about a mile from the 

 end of the Neck, and it gets the full sweep of the tide from 

 the open ocean twice a day. 



The largest colony of Nemerteans was on the outer or 

 exposed side of the Point, and was associated exclusively 

 with hardy northern species. The fishermen often find these 

 worms when digging for clams during the winter, and some 

 of the material used for the origin of the sexual products was 

 obtained from them at that season. When we reflect on the 

 severity of the winter upon the Maine coast, where the mud 

 is exposed between tides to an atmosphere that frequently 



