68 



Cerebratulus lubidus, Yerrill. 

 Bay of Fundy; off Halifax, N.S., &c., common (Verrill). 



Doubtful species. 



Cerebratulus medullatus, Hubrecht. 



H.M.S. Challenger, Station 49 (May 20, 1873), south of Halifax, 

 Nova Scotia, in 85 fathoms, gravel and stones. " This species is probably 

 not a Cerebratulus " as here defined, " but more, likely belongs to Linens or 

 Micrura, and perhaps to some of the species described above." (Verrill.) 



Family C ephalothricidce. 

 Cephalothrix linej\eis (Rathke). 



Planarui linearis, Rathke (1799). 



Cephalothrix linearis, ffirsted (1844) ; et auct. 



ft 



" Long Island Sound to Nova Scotia, at many localities, between tides, 

 under stones and in sand" (Verrill). 



OH^TOPODA.* 



POLYCHZETA. 



Family Seriiulidce. 

 Spirorbis borealis, Daudin (?). 



Serpula spirorbis, L. (1767). 



? Spirorbis spirillum, Gould (1^41) ; non L. 



Spirorbis borealis (Daudin ?) Verrill (1873). 



The commonest species of Spirorbis on the shores of the Gulf of St. Law- 

 rence, attached to alga?, stones, shells, &c. It occurs in very shallow water, 

 and ranges, on the north American side of the Atlantic, from Newhaven, 

 Conn., to Labrador. Sir J. W. Dawson has found|it fossil, in the Pleistocene 

 deposits at Riviere du Loup, attached to shells. 



" Whether this, our most common species, be identical with the European 

 species known by this name is still uncertain. The animals of the various 

 species of Spirorbis are still very imperfectly known, and many species have 

 been described from the tubes alone. Accurate descriptions or figures of 

 the animals are necessary before the species can be determined satisfactorily " 

 (Verrill).! 



* With the exception of the Serpulida;, all the specimens in this list that are stated to 

 have been dredg^ed by the writer, have been either identified or described by Professor W. 

 C. M'Intosh, LL.D., F.R.S., &c., of the University of St. Andrews, Scotland. 



fU, S. Fish Commission, Report for 1871 and 1872 (1873), page 621. 



