NORTH AMERICAN CONCHOLOGY. 



lit 



Xll 



xii 

 xii 



Page. Plate. 



176 xii 



177 xii 

 177 



177 



178 



179 



179 



180 xiii 



180 xiii 



180 xiii 



180 xiii 

 180 



181 



181 xii 



181 



Arcadae. 



Pig. Jfame. 



211 Area pexata Say. 



212 transversa Say. 

 ponderosa Say, e. 1. 

 incongrua Say, e. 1. 



217 a, b Nucula thraciseformis Storer. 



216 radiata Be Kay. 



215 proxima Say. 



221 a, b Gouldi De Kay. 



219 myalis Couth., e. 1. 

 218 limatula Say, e. 1. 



220 sapotilla Gould, e. 1. 

 navicularis Couth., e. 1. 

 tenuis Gould, e. 1. 



213 minuta Gould, e. 1. 



iV. tenuisulcata Couth, 

 acuta Conrad, e. 1. 



Locality. 



Southern coast. 

 Southern coast. 



Northern coast. 

 Maine & Mass. 

 Northern coast. 



Virginia. 









Mytilidae. 





182 



xiii 



222 



Mytilus borealis Lam. 

 M. edulis Gould. 





182 



xiii 



223 



notatus De Kay. 





183 



xxiv 



256 



pellucidus Pennant. 











M. edulis var. pellucidus Gould. 



183 







incurvatus Lam., e. 1. 

 an M. borealis var. ? 



Northern shores. 



183 







ungulatus Linn., e. 1. 





183 







cubitus Say, e. 1. 



Seacoast. 



183 







lateralis Say, e. 1. 



Southern coast. 



183 







hamatus Say, e. 1. 

 M. striatus Barnes. 



Southern coast. 



184 







leucopheatus Conrad, e. 1. 



Southern coast. 



184 



xxiv 



258 



Modiola plicatula l^am. 



M. scinicostata Conrad. 





185 



xxiv 



257 



modiolus Linn. 



Mydlus modiolus Linn. 

 Modiola papuana Lam. 





185 







pectinula Gould, e. 1. 



St. George's b'ks. 



185 







nexa Gould, e. 1. 



Massachusetts. 



185 







discrepans Montagu, e. 1. 



Massachusetts. 



185 







discors Montayu, e. 1. 



Massachusetts. 



186 







Carolinensis Conrad, e. 1. 



Charleston, S. C, 



186 







Americana Leach, e. \. 



Southern coast. 



186 







castanea Say, e. 1. 



Southern coast.' 



