The Shell Rook 



Plate \'n 



48 Rayed Scallop, Peclen irradians, Lam. 



4 9 Fresh-water Mussel, Unio lachrymosiis. Lea 



50 Iceland Scallop, Pectcn Ishndkus, Chemn. 



51 Tulip Horse Mussel, Modiola tulipa, Liim. 



5G 



Copyright, 1908, by Duubl^thiy, Ta^je & Company 



MARINE AND FRESH-WATER BIVALVE SHELLS 



52 Painted Thorny Oyster, Spondyhis pictonim, Chemn. 



53 Rayed Tellen Shell, Tellina virgala, Linn. 



54 Fringed Pearl Oyster, Avicida fimbriala, Dkr. 



55 Ass's-font Thorny Oyster, Spondyhis Girdrropus, Linn. 

 Fresh-water Mussel. Unio crassidcns. Lam. 



