The Shkll Book 



Plate VII 



48 

 49 

 50 



51 



Copyright, 1908, by Doubkday, Page & Company 



MARIXE AND FRESH-WATER BIVALVE SHELLS 

 Raved Scallop, Pecten irradians. Lam. 52 Painted Thorny Oyster 5^a«rfy/«. fktorum, Chemn. 



Fresh-water Mussel, Unio lachrymosus. Lea. 53 Rayed Tellen Shell, Temna znrgala Lmn^ 



Iceland Scallop, Pfc/fn /5/a«rf7V».^ Chemn. 54 Fringed Pearl Oyster, .l.'7c«/a ^mJna/a, Dkr. 



Tulip Horse Mussel, Modiola tulipa. L;im. 55 Ass's-foot Thorny Oyster, Spondylus Gaderopus, Uxm. 



56 Fresh-water Mussel, Unio crassidens. Lam. 



