PLATE VI. 



Fig. I. Cerebratulus montgomerytB^. no\. Dutch Harbor, Unalaska. Natural 

 size. 



2. Head of same species from ventral surface. 



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



if. Amfhiporus angulatus {Yd,\iX.)N&rr\\\. Kadiak. Natural size of large 

 specimen. 



(96) 



