WILLIS NOVA SC 
GANONG. 425 
Margarita argentata, GouLD. Fishing banks. 
Margarita obscura, CoUTH. Do. 
Margarita varicosa, MIGH. Do. 
Margarita cinerea, CouTH. Do. 
Margarita Groenlandica,* Micu. Do. 
Ianthina fragilis, Goutp. Only a fragment found at Sable 
Island to identify by ; probably a drift shell. 
Paludina decisa, Pay. Many lakes of Nova-Scotia—not rare. 
Amnicola porata, GouLD. Dartmouth lakes; common. 
Amnicola limosa, GouLD. Rlock-house Pond, vicinity of Hali- 
fax. 
Skenea Planorbis, Fasr. 
Rissoa minuta, Tort. Common at low water. 
Lacuna vincta, Mont. Fishing banks ; common. 
Littorina littorea, Lin. Whole coast; very com. Extends to 
Pen. EN. BK: l.,/and. Labrador: 
Littorina paliata, Say. Do. do. 
Littorina rudis, Mont. Do. do. 
Lacuna fusca.} Fishing banks; common. 
Scalaria Groenlandica, PERRY. Fishing banks; scarce. 
Turritella erosa, CoUTH. Fishing banks ; scarce. 
Turritella reticulata, M1GH. Do. do. 
Aporrhaise occidentalis, Beck. Bay of Fundy, Sable Island; 
rare. 
Bittium nigrum, Torr. On eel-grass, Pictou. Prof. J. W. 
Dawson. 
Menestho albula, Mutt. Fishing banks; very rare. 
Velutina zonata,GouLp. Fishing banks, Halifax Harbor; very 
rare. 
Velutina haliotoides, MULL. Do. do. 
Marsenina Groenlandica, M.§ Do. do. 
Natica clausa, Sow. Do. do. 
* This is probably a variety of J. undulata. 
7 Its presence in Newfoudland and Labrador has not bean confirmed by other writers. 
We cannot find that Mr. Willis gives elsewhere in his writings any authority for the statement 
as to its occurrence in either place. 
{ We are not sure to what species Willis here refers, 
§ Lamellaria perspicua, St. 
