h 
Plate 41. 
Page 
igure 1. Pecten islandicus beringianus Midcl. 55 
Alaska. 
2. Pecten islandicus beringianus Midcl. 55 
Alaska. 
3. Pecten diegensis Dali.... 51 
Off San Pedro. Deep water. 
4. Pecten paucicostatus Carpenter... 56 
5. Pecten paucicostatus Carpenter. „ . 56 
rt 
j 
