PLATE VI. 
Magasella radiata Dall ; 6/1 [N. W. America]. 
Thecidium Barretti Davidson ex Woodward; 5.1. Page 205. 
Modioln polita Verrill & Smith; 42.5. Page 234. 
Terebratula Bartlettii Dall; 40.0. Page 200. 
Pecten (Janira) hemicyclica Ravenel; 4.0; inside upper valve of 
young shell. Page 207. 
Terebratula incerta Davidson; 11.5; interior. Page 201. 
Same, horizontal view of loop. 
Modiolaria lateralis Say ; 7.5. Page 286. 
Arca ectocomata Dall; 46.0. Page 248. 
Tellina sybaritica Dall; 7.0. Page 277. 
Crassatella floridana Dall; 11.0; young shell. Page 256. 
