82 BRITISH DIATOMACEiE. 



3. Asterionella Bleakeleyii, n. sp. Frustules linear, enlarged at 

 the base. Length of frustule '0022". v.s. 



Marine. Harwich, May 1853, Mr. Bleakeley. 



The meagreness of the above descriptions, the fullest I can give from the 

 dried specimens in my hands, leaves much to be done by more fortunate 

 observers. 



I am, however, tolerably certain of the distinctness of the three forms, 

 A. Ralfsii being obviously different from the other two, and the habitat of 

 A. Bleakeleyii placing it apart from A.formosa, to which it otherwise bears a 

 close resemblance. 



