Plate 4. 
Page 
igure 1. Pec ten caurinus Gould. 57 
Exterior of right valve a little more than half. 
Puget Sound. 
2. Pecten hindsii navar chits Dali. ^4 
Exterior of right valve. 
Arnold Tert. Pectens. 
3. Pecten hindsii navar elms Dali.. 54 
Exterior of left valve. 
Arnold Tert. Pectens. 
4. Axinopsis sericatus Carpenter.123 
Proc. U. S. N. M. 23, from Carpenter’s type specimen. 
