PKOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1886. 



EXPLANATION OF PLATE IV. 



Fig. 1. Bela albrechti Krause, page 300. 



Fig. 2. Bela harpa Dall, page 300. 



Fig. 3. Bela alaskensis Dall, page 299. 



Fig. 4. Bela krausei Dall, page 301. 



Fig. 5. Cerithiopsis var. truncatum Dall page 304. 



Fig. 6. Trophon muriciformis Dall, page 302. 



Fig. 7. Bela sculpturata Dall, page 299. 



Fig. 8. Alvania aurivillii, Dall, page 308. 



Fig. 9. Alvania castanea, Moller, var. alaskana Dall, page 307. 



Fig. 10. Cingula var. scipio Dall, page 306. 



Fig. 11. Macoma middendorffii, Dall, page 308. 



Fig. 12. Onoba cerinella Dall, page 307. 



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