EXPLANATION OF PLATES. 



Plate 1. 



Pago. 



Figure 1. Adula diegensis Dall, Ion. 19 mm 22 



2. Propeamusium alaskense Dall, alt. 26 mm 20 



3. Adula diegensis, dorsal view, Ion. 19 mm 22 



4. Pseudamusium vancouverense Whiteaves, alt. 6.5 mm 20 



. 5. Pseudanuisium vancouverense Whiteaves, alt. 6.5 mm 20 



6. Vesicomya (Callogonia) stearnsii Dall, Ion. 25 mm 40 



7. Vesicomya (Callogonia) stearnsii Dall, Ion. 25 mm 40 



8. Antiplanes santarosana Dall, alt. 36 mm 71 



9. Antiplanes thalaea Dall, alt. 40 mm 72 



Figures 1 and 3 drawn by Miss Evelyn Mitchell, the others by the late 



Doctor J. C. McConnell. 



Plate 2. 



Figure 1. Panomya arctica turgida Dall, Ion. 93 mm 54 



2. Dermatomya leonina Dall, Ion. 28 mm 2S 



3. Protocardia richardsonii Whiteaves, Ion. 10 mm 40 



4. Atrina oldroydi Dall, dorsal view, Ion. 237 mm 17 



5. Atrina oldroydi Dall, interior view, Ion. 237 mm 17 



6. Atrina oldroydi Dall, exterior view, Ion. 237 mm 17 



All figures drawn by the late Doctor J. C. McConnell. 



Plate 3. 



Figure 1. Rochefortia compressa Dall, Ion. 8 mm 37 



2. Psephidia cymata Dall, Ion. 6 mm 44 



3. Calyptogena clongata Dall, Ion. 44 mm 32 



4. Cuspidaria subglacialis Dall, Ion. 39 mm 28 



5. Acteon (Rictaxis) painei Dall, alt. 8 mm 60 



6. Mtisculus impressus Dall, Ion. 19 mm 23 



7. Mtisculus impressus, dorsal view, Ion. 19 mm 23 



8. Lora grippi Dall, alt. 9 mm 74 



9. Spisula (Sym morphomactra) planulata Conrad, Ion. 35 mm 52 



10. Dermatomya tenuiconcha Dall, Ion. 16 mm 27 



Figures 5 and 9 drawn by the late Doctor J. C. McConnell, the others by 

 Miss Evelyn Mitchell. 



Plate 4. 



Figure 1. Outlines of 28 specimens of Mya intermedia from Chignik Bay. 



Alaska; natural size 52 



Plate 5. 



Figure 1. Eupleura grippi Dall, alt. 21.3 mm 109 



2. Hemitoma goliscliae Dall, Ion. 20 mm 186 



3. Cancellaria (Progabbia) cooperi Gabb, alt. 95 mm 83 



4. Cancellaria (Progabbia) cooperi dorsal view; this is taken 



from the largest known specimen, now in the Golisch collec- 

 tion, in the Southwest Museum, Los Angeles, California 83 



5. Algamorda netveombiana Hemphill, alt. 6 mm 153 



213 



