178 BULLETIN 37, UNITED feTATES NATIONAL MUSEUM. 



PLATE III. 



Fig. 1. Cuspidaria ohesa Lovfen, var.? 13.0. 



2. Cuspidaria Jeffreysi Dall ; 15.0. 



3. Cuspidaria arcuata Dall ; 12.5 ; inside. 



4. Same, outside. 



5. Myonera limatula Dall ; 11.15. 



6. CardiomyapectinataC'pT.j^ar. tenw^fn^sfsLcche [N.W. coast of America]; 6.0 



7. Myonera lamellifera Dall ; 12.5. 



8. Leiomya ( Plectodon) granulata Daill ; 11.0. 



9. Cardiomya corptilenta Dall ; 14.0. 

 10. Cardiomya striata J e&rejs; 19.0. 



PLATE IV. 



Fig. 1 a. Pecten {Amusimn) Dalli E. A. Suiitli; 62.0; inside of lower valve. 



1 b. The same, inside of upper valve. 



2. Pecten (Pseudamusium) Sigsbeei Dall ; 11.5. 



3. Pecten (Propeamusium) Pourlalesianus Dall, var. marmoratus ; 13.5. 



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



5 a-b. Dimya argentea Dall ; 12.0. 



6. Cardium {antillarum Orb. var.?) ceramidum Dall ; 8.2. 



7. Cardiurn peramaMlis Dall ; 12.5. 



8. Abra lioica Dall ; 8.1. 



9 a-b. Saxicava azaria Dall ; 25.0. 



PLATE V. 



Fig. 1, 2. Pecten {Propeamusium) cancellatus E. A. Smith; 26.0. 



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



3. Pecten (Propeamusium) Sayanus Da,l\; 15.5. 



4. Pecten caurinus Gould, young valve; 6.0. 



5. Pecten (Propeamusium) Holmesii Dall; 12.0. 



6. Hinnites AdamsiDall; upper valve ; 28.0. 



7. 7 a. Pecten (Propeamusium) alaskensis Dall ; 22.8; West America. 



8. Pecten (Pseudamusium) reticulus Dall; 7.0. 



9. Pecten (Propeamusium) Say anus Dall; 15.5. 



10. Pecten (Pseudamusium) reticulus Da,ll; 7.0. 



11. Pecten (Propeamusium) Holmesii Dall ; 12.0. 



12. Pecten (Propeamusium) Pourtalesianus Dall; 13.5. 



PLATE VI. 



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



Thecidium Barrettii Davidson ; 5.1. 



Modiola polita V. and S.; 42.5. 



Terebratula Bartlettii Dall; 40.0. 



Pecten (Janira) hemicyclicus Ravenel ; 4.0. 

 Inside view of upper shell of young fry. 



Terebratula incerta Davidson ; 11.5 ; interior. 

 The same ; horizontal view of loop. 

 Modiolaria lateralis Say ; 7.5. 

 Area ectocomata Dall ; 46.0. 

 Tellina sybaritica Dall ; 7.0. 

 Crassatella Jioridana Dall; young shell ; 11.0. 



Fig. 1. 





2. 





3. 





4 



a-c, 



5. 





6. 





6 



a. 



7, 



8. 



9, 



10. 



11. 





12. 





