ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 249 



No. 



Name. 



Lithophagus calyculatus, n.s 



plumula, Hani 



— aristatus, Sol. 



= Modiola caudigera, Lam. 



= Mylilus ropan, Desh. 



, var. gracilior 



, var. tuimdior 



— cinnamonieus, Chemn 



Leiosolenus spatiosus, n. s 



, sp. ind 



Arcades. 

 Area grandis, Brod. 8f Sow 



— multicostata, Sow 



— Plabiata, Sow 



} = A. labiosa, Sow. 



?=A. incongrua, Say. 



— bifrons, n.s , 



— tuberculosa, Sow 



?-\-A. trapezia, Desh. 



-\-A. similis, C. B. Ad. 



— reversa, Gray 



— A. hemicardiurn, Koch. 



— Pbrevifrons, Sow 



— emarginata, Sow 



— , sp. ind. (a) 



— (») 



Byssoarca Pacifica, Sow 



— mutabilis, Sow 



Comp. Area Americana, D'Orb. = imbricata 



Brug. 



— fusca, Brug 



— vespertilio, n. s 



— illota, Sow 



Comp. A. Tabogensis, C. B. A(L 



gradata, Brod. 8f Sow , 



? = A.squamosa,Lam. = A.Bomingensis, Lam 



= Arca clathrata, Defr. 

 Comp. B. divaricata, Sow. 

 Comp. B.pusilla, Sow. 

 Comp. A. donaciformis, Rve. 



— solida, Sow , 



Pectunculus insequalis, Sow. (non Gray) ..... 



=P. pectiniformis, Wood (non Lam.) 

 ?-}-P. assimilis, Sow. 

 -* — ? multicostatus, Sow 



Nuculidce. 



Nucula exigua, Sow 



Leda Elenensis, Sow 



AviculidcB. 



Pinna maura, Sow 



lanceolata, Sow 



Prugosa, Sow 



Avicula sterna, Gld. 



= A. Atlantica, Mke. 



Margaritiphora Mazatlanica, Hani. 



— A. jimbriata, Dkr. 

 Isognomon Chemnitzianum, D'Orb , 



= Pernaflexuosa, Sow. 



Freq. 



Other Localities. 



174 

 175 

 176 



1764 

 176c 



177 



L78 

 .79 



180 

 181 

 182 



183 

 184 



185 



186 

 187 

 188 

 689 

 189 

 190 



191 

 192 

 193 



194 



195 

 196 



197 



198 

 199 



200 

 201 

 202 

 203 



204 



205 



v. r. 

 e. r. 



e. r. 



1 



v. c. 

 2 

 2 



e. r. 

 v. c. 



1 



e. r. 

 2 

 1 

 r. 

 r. 



1 



1 



e. r. 



v. r. 



n. u. 

 3 



com. 

 n. u. 

 v.r. 

 n. u. 



v. r. 



n. u. 



Panama. 



Senegal, West Indies. 



Mauritius, Philippines, Cuba, 

 Venezuela, Central America. 



Pan., Real Llejos, Bay Guayaq. 



Gulf Tehuantepec. 



Real Llejos, Tumbez, W. Indies 



Panama, Real Llejos. 



Panama, Tumbez. 



Tumbez. 



Atacamas, Rl.Llej.,Xipix.,Pan. 



St. Elena, Bijooga Island. 

 Island of Plata, Panama. 



East and West Indies. 



Gulf Nicoya. 



St. Elena, Taboga, West Indies, 

 and Fossil. 



Panama, Payta. 

 Panama, Real Llejos, Puerto 

 Portrero, Guayaquil. 



Ecuador, Guayaquil. 



Panama, Bay of Caraccas. 

 Panama, St. Elena. 



Panama. 

 Puerto Portrero. 

 Panama. 

 Panama. 



Panama, W. Indies, Conchagua, 



