266 



THE CANADIAN NATURALIST. [Vol. viL 



MOLLeSCA. 



Ostrea borealis Lam. Solen ensis, v, Americana. 



O. Virginiana Lister. Teredo, sp. (in a spruce log). 



JVIytilus ediilis Linn. Haminea solitaria Saij. 



jVlodiola modiolus Linn. Cylichna pertenuis JJiffh, 



Mercenaria violacea Schiim. Acmoea alveus Conrad. 



Gemma Tottenii St. Crepidula fornicata Linn, 

 Callista convexa Sa>f. " unguiformis Lam.. 



Petricola pholadiformis Lam. Paludinella minuta. 



and var. dact^'lus. Odostomia trifida Totten. 



Mactra solidissima Chemn. Turbonilla interrupta Totten.. 



Mya arenana, Lunatia heros Satj. 



" truncata. Bittium nigrum Totten. 



Angulus tener Say. Nassa obsoleta Say. 

 Tiiracia Conradi (fine and '^ trivittata Say. 



frequent). Astyris lunata Say. 

 Pandora trilineata Say. 



ECHINODERMATA. 



Asterias vulgaris St. Echinus Drobachiensis, 



Cnbella sanguinolenta. Caudina arenata (Gould). 



Ecliinarachnius parma. 



Leaving Shediac by daybreak on the 22d of August, we 

 dredged from that place to the Egmont Bank, aud stood back 

 again to the south shore the same evening. The Egmont Bank 

 is a small rocky patch, situated between Shediac Bay and Cape 

 Egmont, Prince Edward Island. The depth on it is less than 

 ten fathoms, and the bottom consists of coarse sand and stones, 

 the latter covered with Lamlnarice and smaller algae, and per- 

 forated by Petricola plioladiformis. Annelids are numerous in 

 the sand, from which also about twelve species of shells were 

 collected. Early the next morning (August 23d), we stood over 

 to the Prince Edward Island side, and dredged along the outside 

 of Bedeque Bay, from off St. Jacques to a little to the south of 

 Sea Cow Head. In the afternoon a falling barometer indicating 

 the imminent approach of a storm, we made for Charlottetown^ 

 and reached there only just in time to weather out the memorable 

 gale of the 24th of August. We subsequently managed to 

 dredge in Hillsborough Bay ; also, on the opposite shore, off Pug- 

 wash Harbor, N. S., and oft" Shediac, Buctouche and Kichibucto, 

 in New Brunswick, and on the 9th of September I left the 

 schooner and proceeded home. On the Prince Edward Island 

 side of Northumberland Straits proper, the bottom is usually a 

 red (Triassic) clayey mud, while on the New Brunswick side it 



