some Recent Pablicationa concerning Diatoms. 35 



Amphora ehta (p. 109). 



This is the same form that is figured in my Etudes sur 

 I'End. pi. V, figs. 4, 5, representing most probably Gregory's 

 A. excisa. I must have overlooked the pyrenoids. 



Amphora ostrearia, Breb. (p. 110). 



I have the same doubt as Cleve concerning the correctness 

 of the determination of this species ; its endochrome, although 

 of the same type as in A. osii'earia, has a different habitus 

 from that of the latter species (see A. tela). 



Amphora epsilon (p. 111). 



A form with which I am well acquainted. It is A. acuta, 

 var. arcuata^ A. S., the same as in Etudes s. I'End. d. D. 

 pi. vi. fig. 1. I can fully confirm the correctness of this 

 determination. 



Amphora teta (p. 112). 



This is the genuine A. ostrearia] figure 149 represents 

 the endochrome exactly as I have recently observed it in 

 California, where this species is very common ; the plates arc 

 large, with undulated and broadly indented margins. 



Auricula punctata, Karst. (pp. 115, 116). 



Is the same as Auricula qiiadranrjulata^ Mer. (Et. s. I'End. 

 pi. vi. fig. 18). Seems to differ from A. insecta^ to which it 

 is nearly related, in the presence of puncta. 



Auricula staurophora, Karst. 



Same as the foim described and figured in Et. s. I'End. 

 pi. vi. fig. 14, under the name of Amphora quadrata^ a name 

 which seems to have lost all meaning because of the many 

 and various forms to which it has been applied (see, for in- 

 stance, Perag. D. mar. d. Fr. p. 220, pi. xlix. fig. 19). I do 

 not believe, however, A. staurophora to be sufficiently distinct 

 from Auricula stauroneis, Mer. (/. c. pi. vi. figs. 15, IGj, to 

 constitute a good species ; one of these should be considered 

 merely a variety of the other. The granules are represented 

 in my paper as being elliptical, which is to be attributed to 

 the material not being in a sufficiently fresh condition. I also 

 failed to describe the pyrenoids. 



Nitzschia angularis, W. Sm. (p. 120). 



Very different from the form I have described under tlii.s 

 name (Et. s. I'End. pi. vii. figs. 1, 2). In California I have 

 observed quite a number of forms which could hardly be 

 separated from N. distans ; at the same time their cell-couteuts 



3* 



