130 BIOLOGICAL SURVEY OF 



Order SCHIZONEMERTEA 



Lineidae 

 LiNEUs Sowerby 



The two species noted below may be distinguished when 

 alive by their behavior when teased with a pipette. L. ruber 

 when disturbed merely contracts, while L. socialis, under the 

 same conditions, can only shorten its body by coiling into a 

 cylindrical helix. 



L. RUBEE (O. F. Miiller). {viridis Verrill, 1892, p. 418, pi. 

 37, figs. 5-5a; pi. 38, figs. 6-6d; pi. 39, figs. 18, 22.) All 

 varieties of this species are found on shore between tide marks 

 in great abundance. The breeding season is during June and 

 July. Stations : S 43, 48, 50. 



L. SOCIALIS (Leidy). (Verrill, 1892, p. 424, pi. 37, figs. 8, 8a; 

 pi. 38, figs. 7, 7a.) Four specimens were found living with 

 the preceding. The color was bright reddish brown. Sta- 

 tions: S48,49. 



Cerebratulus Renier 

 C. LACTEus (Leidy). (Verrill, 1892, p. 433, pi. 35, figs. 1, la ; 

 pi. 36, fig. 2; pi. 37, figs. 1-lb; pi. 39, figs. 19-21.) This 

 species is very abundant in the muddy coves along the western 

 and southwestern parts of Mount Desert Island. Specimens 

 have been taken up to 28 cm. long. These are young speci- 

 mens and hence the breeding season must be in the early 

 spring. Stations : S 33, 43, 46, 48, 50. 



Order PALEONEMERTEA 



Cephalotrichidae 

 Cephalothrix Oersted 

 C. FiLiFOEMis (Johnston).^ {linearis Verrill, 1892, p. 442, 

 pi. 36, figs. 4, 5; pi. 39, figs. 10-15.) This species is found in 

 great abundance under stones embedded in mud between tide 

 marks, particular in mussel beds. Their breeding season 

 must be in the early spring, for a great number of young 

 animals are found in July and August. Stations : S 43, 48-50. 



^This is probably C. spiralis Coe (1930, p. 101).— Ed. 



