Plate 21. 
Page 
igure 1. Cuspidaria subglacialis Dali. 98 
Bull. 112, U. S. N. M. 
2. Barnca pacifica Stearns.209 
3. Barnca pacifica Stearns . 209 
4. Barnca pacifica Stearns.209 
Figures 2, 3, 4 arc* from Stearns’ type specimen. 
5. Pholadidea ovoidea Gould.-..212 
Boston Jour. Nat. Hist. 
6. Pholadidea ovoidca Gould.212 
Figures 5. 6 are from Gould’s type figure. 
* 7. Rochefortia comprcssa Dali.124 
Bull. 112, U. S. N. M. 
8. Botula falcata Gould. 71 
Boston Jour. Nat. Hist. 
9. Botula falcata Gould....- . 71 
Figures 8, 9 are from Gould’s type figure. 
10. Pholadidea penita Conrad.. ..211 
Jour. Acad. Nat, Sei., Phila. 
From Conrad’s type figure. 
11. Labiosa undulata Gould. 191 
Boston Jour. Nat. Hist. 
From Gould’s type figure. 
