153 



Family Siphonodentaliidce. 



SiPHONODENTALIUM LOBATUM (Sowerby). 



Dentaliuvi vitreiim, M. Sars (1851) ; not D. vitrcnm, Gmelin. 

 SiphonodcHtuliuia vitreum, M. Sars (1859), 

 Dentalium lobatum, G. B. Sowerby, jun. (ISGO). 



Dredged by the writer in 1871-73, in deep water at many localities in the 

 Gulf of St. Lawrence north of the Baie des Chaleurs, associated with the 

 preceding species. Sir. J. W. Dawson has found fossil specimens of it in the 

 Leda clay of Murray Bay. 



SiPHONODENTALIUM AFFIXE, M . SarS. 



" A specimen smaller and more slender than the preceding species and 

 which I refer toS. affine, was dredged by " our party in the SS. Speedwell of 

 the U. S. Fish Commission " in 1877, in Bedford Basin, near Halifax, Nova 

 Scotia, in 35 fathoms, soft mud" (Verrill ; Proc. U. S. Nat. Mus., vol. iii., 

 p. 395). 



GASTEROPODA. 



APLACOPIIORA. 



Family Chcetoderinatid<e. 



Ch^toderma nitidulum, Loven. 



Passamaquoddy Bay, 30 fathoms (1872) ; and common in 10-100 fathoms, 

 muddy bottom, off southern New England and Nova Scotia (Verrill). 



POLYPLACOPHORA. 



Family Lepidopleurido'. 

 Lepidopleurus cancellatus (Sowerby). 



Chiton cancellatus, Sowerby (1839) ; et auct. 



Leptochiton cancellatus, H. and A. Adams (1854) ; and Dall (1878). 



Lepidopleurus cancellatus, G. 0. Sars (1878). 



Off Halifax, Nova Scotia, in 95 fathoms, U. S. Fish Commission, 1877; 

 an immature specimen identified by Dall as probably of this species. 



