EXPLANATION OF PLATES. 
Plate 1. 
Page. 
Figure 1. Adula diegensis Dali, Ion. 19 mm 22 
2. Propeamusium alaskense Dali, alt. 26 mm 20 
3. Adula diegensis, dorsal view, Ion. 19 mm 22 
4. Pseudamusium vancouverense Whiteaves, alt. 6.5 mm 20 
5. Pseudamusium vancouverense Whiteaves, alt. 6.5 mm 20 
6. Yesicomya (Callogonia) stearnsii Dali, Ion. 25 mm 40 
7. Yesicomya {Callogonia) stearnsii Dali, Ion. 25 mm 40 
8. Antiplanes santarosana Dali, alt. 36 mm 71 
9. Antiplanes thalaea Dali, 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 Dali, Ion. 93 mm 54 
2. Dermatomya leonina Dali, Ion. 28 mm 28 
3. Protocardia richardsonii Whiteaves, Ion. 10 mm 40 
4. Afrina oldroydi Dali, dorsal view. Ion. 237 mm 17 
' 5. Atrina oldroydi Dali, interior view. Ion. 237 mm 17 
6. Atrina oldroydi Dali, exterior view, Ion. 237 mm 17 
All figures drawn by the late Doctor J. C. McConnell. 
Plate 3. 
Figure 1. Roehefortia compressa Dali, Ion. 8 mm 37 
2. Psephidia cymata Dali, Ion. 6 mm 44 
3. Calyptogena elongata Dali, Ion. 44 mm 32 
4. Cuspidaria subglacialis Dali, Ion. 39 mm 28 
5. Acteon (Rictaxis) painei Dali, alt. 8 mm 60 
6. Musculus impressus DaW, Ion. 19 mm 23 
7. Musculus impressus, dorsal view. Ion. 19 mm 23 
8. Lora grippi Dali, alt. 9 mm 74 
9. Spisula (Symmorphomactra) planulata Conrad, Ion. 35 mm 52 
10. Dermatomya tenuiconcha Dali, 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 Dali, alt. 21.3 mm l 109 
2. Hemitoma golischae Dali, Ion. 20 mm 186 
3. Cancellaria {ProgahMa) 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 newcombiana Hemphill, alt. 6 mm 153 
213 
