178 BULLETIN 37, UNITED STATES NATIONAL MUSEUM. 



PLATE III. 



FIG. 1. Cuapidaria obesa Loven, var.? 13.0. 



2. Cuspidaria Jeffreysi Dall ; 15.0. 



3. Cuspidaria arcuata Dall ; 12.5 ; inside. 



4. Same, outside. 



5. Mi/onera limatula Dall ; 11.15. 



6. Cardiomya pectinataCpr., var. fcmw^ewsisLeche [N.W. coast of America]; 6.0. 



7. Myonera lamellifera Dall ; 12.5. 



8. Lciomya (Plectodon) granulata Dall ; 11.0. 



9. Cardiomya corpulenta Dall ; 14.0. 

 10. Cardiomya striata Jeffreys ; 19.0. 



PLATE IV. 



FIG. 1 a. Pecten (Amusium) Dalli E. A. Smith ; 62.0; inside of lower valve. 



1 b. The same, inside of upper valve. 



2. Pecten (Pscudamusium) Sigsbeei Dall ; 11.5. 



3. Pecten (Propeamusium) Pourtalesianus Dall, var. marmoratua ', 13.5. 



4 a-b. Pecten (Pseudamusium) imbrifer Loven ; 12.5. 



5 a-b. Dimya argentea Dall ; 12.0. 



6. Cardiwm (antillarum Orb. var.?) ceramidum Dall ; 8.2. 



7. Cardium peramabilis Dall ; 12.5. 



8. Abra lioica Dall; 8.1. 



9 a-b. Saxicava azaria Dall ; 25.0. 



PLATE V. 



FIG. 1, 2. Pecten (Propeamuslum) cancellatiis E. A. Smith; 26.0. 



la. The same ; a bit of the sculpture enlarged. 



3. Pecten (Propeamusium) Sayanus Dall ; 15.5. 



4. Pecten canrinus Gould, young valve ; 6.0. 



5. Pecten (Propeamnsium) Holmesii Dall ; 12.0. 



6. Hinnitea Adamsi Dall ; upper valve ; 28.0. 



7. 7 a. Pecten (Propeamnsium) alaskensis Dall ; 2^.8; West America. 



8. Pecten (Pseudamusium) reticulua Dall; 7.0. 



9. Pecten (Propeamusium) bayanus Dall; 15.5. 



10. Pecten (PseudaniHsinm) reticuliis Dall; 7.0. 



11. Pecten (Propeamusium) Holmesii Dall ; 12.0. 



12. Pecten (Propeamusium) Pourtaleaianu* Dall; 13.5. 



PLATE VI. 



FIG. 1. Magasella radiata Dall ; 6.1 ; N. W. America. 



2. Thecidium Barrettii Davidsou ; 5.1. 



3. Modiola polita V. aud S.; 42.5. 



4 a-c. Tertbratula Bartleltii Dall; 40.0. 



5. Pecten (Janira) liemicyclicus Ravenel ; 4.0. 



Inside view of upper shell of young fry. 



6. Terebratula inccrta Davidson ; 11.5 ; interior. 



6 a. The same ; horizontal view of loop. 



7. 8. Modlolana lateralis Say ; 7.5. 

 9, 10. Area ectocomata Dall ; 46.0. 



11. Tellina aybaritica Dall ; 7.0. 



12. Crassatella floridana Dall ; young shell ; 11.0. 



