164 



BIOLOGICAL SURVEY OF 



In Aporrhais occidentalis var. mainefisis, we have our own 

 special mollusc which has been reported from but one other 

 place, the Isle of Shoals, and forms the subject of figure 38. 



Fig. 38 A series of Aporrhais occidentalis var. mainensis Johnson. Showing 

 growth of lip. Actual size. 



