Explanation of Plate 17 



Figs. 1, 2. — Symmetrogephyrus vestitus (Broderip and Sowcrby): 1, a specimen from 295 

 feet with many tufts of hairs; 2, a specimen from 522 feet with sparse tufts of hairs. 



Figs. 3, 4. — Trackydermon albus (Linnaeus), a dark and a light form, respectively, from 217 

 feet. 



Fig. 5. — Buccinum angulosum Gray, a tvpical adult specimen from 522 feet. 



Figs. 6, 7. — ^^Oenopota" pyramidalis var. vahli Moller from 217 feet. 



Figs. 8, 9. — Cingula castanea Aloller var. alaskana Dall: 8, a juvenile from 341 feet, with 

 egg capsules on shell; 9, an adult from 477 feet. 



Magnification: 1-5, X 1.1; 6, 7, X 5.4; 8, X 23.7; 9, X 11.9. 



