ARCA. Panama Shells. 259 



Station. Attached to stones ; Cuming ! Eeeve. 



Our specimens were found under stones near low water mark. 



Habitat. Mazatlan ; Broderip : also Beechey's Voyage. 



St. Elena ; Cuming ! Eeeve : also Orbigny. 



St. Elena ; Jay. 



Mexico ; Hanley. 



Santa Barbara ; E. Jewett ! Gould MSS. 



Taboga ; C. B. A. ! 

 3 specimens were found. 



417. Area grandis. 



Synonymy. 



Area fjrandis Brod. et Sowb. in Zool. Jour. IV. 365. 1829. 



Reeve Conch. Icon. pi. 1. f. 4. Dec. 1843. 



Hanley Descr. Catal. p. 1GO. 1845 ? 



Orb. Voy. Amer. Merid. Moll. p. 637. 1846. 



Station. Our specimens were found lialf buried in mud and 

 small algae, under trees, a little above half tide level. 



Habitat. Unknown ; Broderip. 



Eeal Llejos, Bay of Guayaquil, &c., Western Coast 



of S. America ; Cuming ! also Hinds ! Eeeve. 

 Guayaquil; Fontaine! Orbigny. 

 Panama ; Jay. 

 Panama : C. B. A. ! 



13 specimens were obtained. This species is used by the 

 natives for food. A single valve taken from a heap of the 

 shells of edible mollusks weighs 2\ Ibs. 



418. Area mutabilis. 



Synonymy. 



JByssoarca mutabilis Sowb. in Proc. Zool. Soc. Lond. p. 17. Feb. 1833. 



Reeve Conch. Icon., pi. 13. f. 85. Apr. 1844. 



Hanley Descr. Catal. p. 156. 1845? 



