20 Saxicava, Pelricola. Venus. 



Mytilus pholadis L. 



Saxicava gronlandica P &: Mich. 



207 4 var. Gronlandia. 



208 1 antarctica Phil. Fret. Magellan. 



Petricola Ijaiii. 



209 1 pholadiformis Lam. Am. bor. 



P. fornicata Say. 



210 1 typica (Choristodon) Jonas. I. Antill. 



211 2 lithopaga (Venus) Retz M med. 



P. sulcata Lam Syst. 



212 3 monstrosa(Venus)Ch.7f. 445-46. 1. Nicobar. 



213 1 lapicida Ch x. f. 1664. 5. I. Antill. 



P. costata Lam. Syst. 



Fam. Concliacea. 



V. africana Miihif. 

 V. donaeina Mus. Paris, non Gm. 

 Tapes ]VIeg:erle. 



225 2 litterata L. Ind or 



