JONKS — MOLLUSCA OF NOVA SCOTIA. 421 



I have so often referred, contains many such species presented with- 

 out explanation as to their origin. The list which formed the basis 

 of this catalogue was prepared by myself, and contained very few 

 species, not indigenous, but in its subsequent compilation the 

 numerous additions from other sources caused the introduction of 

 many species not of native origin, many of which are presented 

 without comment, a circumstance, which was owing to the short 

 time afforded for preparation for the press, along with other exigen- 

 cies which prevented me from giving it that amount of attention 

 and care which it deserved. 



The foregoing explanation is deemed to be requisite for those 

 who cannot avoid observing the errors referred to. 



J. SOMMERS, 



For Editing Com. 



Art. IX. — Mollusca of Nova Scotia, (corrected to date, 1877.) 

 By J. Matthew Jones, F. L. S. 



CLASS CONCHIFERA. 



Fam. Pholadid.e. Leach. 



Teredo navalis, L. This species is inserted in Mr. Willis's 

 privately printed list with a query. It was taken from a log in 

 a spar-yard at Dartmouth. Marine Slip timbers at Pictou. 

 (Whiteaves.) 



T. d Hat at a, St. Very large specimens have been received from 

 Sable Island, taken from w^reck timber. ( Willis.) 



T. Xorvagica, Speng. Marine Slip timbers at Pictou. {White- 

 aves) 



Zirphoea crispata, Morch. Large specimens have been received 

 from Sable Island. (Willis.) 



Fam. Solenid,e. 



Ensatella Americana, Verrill. Sandy shores ; whole coast. 

 SUiqua squama, St. Fishing banks ; rare. (Willis.) 

 7 



