386 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



maturing females are all present, and at Station 3518 (60°22' N., 

 171°42' W., August 3, 1893) an ovigerous female, 30 mm. in length, 

 was collected. Evidently some breeding takes place during early 

 August in the Bering Sea. 



Dunbar's work on the life history of P. libellula and his proposed 

 breeding cycle are of considerable interest. Much additional col- 

 lecting, especially in the winter months, is needed before the validity 

 of his conclusions can be adequately assessed. 



