A. E. 'VervUl — Marine Nemerteansi of New England, etc.. 417 



Tlie species are almost exclusively marine and are found in deep 

 water as well as between tides. Many are fossorial in their habits, 



Fig. 7. Pilidium of Micrura, much enlarged: c, apical cilium; h, cephalic lobe; 

 m, mouth; i, intestine; u, bands of cilia; o, young nemerteau developing in the in- 

 terior, showiug its head with two ocelli. 



living in sand or mud, or beneath stones. Some of the large Hat 

 species of Cerebratulus leave their burrows and swim with an undu- 

 latory, eel-like movement at the surface of the sea at night. 



Family, Lineid^e Mcintosh. 



Body simple, generally much elongated in extension, very contrac- 

 tile, usually thickest in the region of the oesophagus, and becoming 



fiffill!^ 



Fig. 8. Lineidoi. A, Cerebra lulus luridus, ventral side; m, mouth; s, one of the 

 olfactory slits or cephalopori; p, proboscis-pore. B, head of the same, side view. C, 

 tail ; X, anus. D, head of Lineus viridis, young, enlarged ; s, one of the cephalopori ; 

 p, proboscis-pore. 



more or less flattened farther back, where the saccular appendages 

 of the intestine and the reproductive glands occupy the sides. Head 

 simple, with elongated lateral olfactory slits or cephalopori. 



LiineilS Sowerby, 1806. 



Lineus Sowerby, British Miscel., p. 15, pi. 8, 1806. 



BorJasia Oken, Lehrbuch, p. 36.5, 1815; Blainville, Diet. Sci. Nat., .57, p. 575, 1828 ; 



Johnston, Catal., p. 21, 1865. 

 iVemerfe.s Cuvier, Regne Anim., vol. iv, p. 37, 1815; Dies, {^pars), op. cit., p. 264. 

 Lineus CErsted, Naturh. Tidsskr., iv, p. 576, 1844. 

 Meckelia (jjars) Diesing, Syst. Helm., vol. i, p. 265, 1850. 

 Notosjiermus Diesing, op. cit., vol. i, p. 260. 

 Li'neMS Stimpson, Prodromus, p. 160, 1851. 

 Cerebratulus (pars) Stirapson, Prodromus, p. 160, 1857. 

 Poseidon Girard, Proc. Boston Soc. Nat. Hist., iv, p. 185, 1852. 

 Nemerfes Verrill, lavert. Vineyard Sound, etc., 1873. 



