Explanation of Plate 10 



Fig. 1. — BucciiiHii! polare \ar. orotundum Dall from 80 feet (Mar. 20, 1950), showin.t: the 

 tumid body wh-orl. 



Fir.s. 2, 3. — Buccinum polare Gray varieties from 64 feet (May 15 and May 17, 1950, re- 

 spectively), showing variation in axial folds and spiral sculpture. (These may be im- 

 mature specimens of var. orotundum.) 



Fig. 4. — Buccinum polare Gray, with its operculum, from 64 feet (Ma\' 17, 1950), near the 

 typical in form. 



Fig. 5. — Buccinum undatum \'ar. striatum Pennant from 477 feet. 



Figs. 6, 7. — Buccinum fringillum Dall from 453 feet. 



Figs. 8, 9. — Buccinum ciliatum Fabricius from 162 and 341 feet, respccti\'ely. 



Fig. 10. — Buccinum angulosum Gray, typical form, a young adult from Eluitkak Pass 

 (Aug. 10, 1948). 



Figs. 11-13. — Piicifusus kroyeri (Moller): 11, a typical P. kroyeri from 125 feet; 12, 13. 

 slenderer forms, from 420 feet, with weak axial folds and microscopic spiral sculpture. 



Magnification: All X .73. 



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