PLATE VI. 



Fig. 1. Cerebratulus montgomeryi ?,-p. nov. Dutch Harbor, Unalaska. Natural 

 size. 



2. Head of same species from ventral surface. 



3. Cerebratulus occidentalis sp. nov. Yakutat. Natural size. 



4. Amfhiforus angulatus (Fabr.) Verrill. Kadiak. Natural size of large 

 specimen. 



(96) 



