nial lives for a long time, and affixes itself tenaciously to the rocks after the 

 shell is removed. 63 and 65, together living on rocks near high-water mark, 

 and on eel grass in pools left by the tide. 89, perhaps young of Mr. Gabb's spe- 

 cies O. punctatus ; two living specimens, as yet undetermined, probably a new 

 "-oecies. 



