80 Proceedings of thr Biological Society of Washington . 



indications of sou I pin re mi the spire, l>nl the specimen is too worn to 

 make sure of this. Base protracted, the anterior portion marked by the 

 continuation of strong lines of growth and indications of strong spiral 

 iirations. Aperture oval, decidedly channeled anteriorly, posterior angle 

 acute; outer lip rather thick; inner lip sigmoid, reflected over and ap- 

 pressed to the base ; parietal wall covered by a thick callus. 



The type has seven whorls remaining (the extreme tip being lost) and 

 measures: length, 12.5 mm.; diameter, 4.5 mm. This specimen is the 

 largest Aesopus so far known from the West Coast of America. 



