No. 549] A CASE OF POLYMORPHISM 



ically in some fashion. It is evident, howeve 

 species in question and other allied forms shou 

 intensively studied by workers in other loeali 

 we venture upon the final solution of so intrie; 

 tion. For the present all that needs ho said 

 material studied by the writer and designat 

 phrases, the saccate, the Inuupetl, and the c<r 

 forms, belongs to the species Asplancluia auip L 

 present constituted; and it seems no less eortai 

 material is sharply segregated from A. hriyli 

 spite the exceeding closeness of this latter spe 

 above mentioned saccate form of A. amphora. 



A brief resume of the chief characters of A. 

 amplmra, as here studied, will he of use to rape 

 It is as follows : 



Form A, saccate type produced from resting egg 

 rapid parthenogenesis, through several e 

 ing diameter of body or less, nearly circular in out 

 the cylindrical body, which rests on side when w 



