274 THE AMERICAN MONTHLY [Sept. 



be possible to obtain gatherings containing entirely dif- 

 ferent species from any that I have found. As I have 

 written before, the complete literature of the subject is 

 not accessible to me, and although I find many kinds not 

 described in such books as I have, I do not know that 

 they are not described in others. From my own exper- 

 ience I think it would be possible to more than double 

 the list of North American species given in Wolle's book 

 by anything like a thorough investigation. In the Mor- 

 ris Cove soundings, made several years ago, were many 

 unfamiliar kinds, among them was one belonging to the 

 Navicula elliptica series, which was curiously constricted 

 or shrunken on one side. In my correspondence with 

 Dr. Ward at that time about these species, he refers to 

 this one as "the little lopsided fellow\" In the Silver 

 Sands and Savin Rock material mentioned in former 

 article, are several related forms ; one appearing to be 

 a variety of Navicula Smithii, another of N. fusca, an- 

 other is still more elongated and with much finer striae; 

 all these are constricted and bent similarly to the N. 

 elliptica var. from Morris Cove. With No. 21 of "Le 

 Diatomiste" was sent out Prof. Brun's "Diatomees" for 

 April and May, 1895 ; in this I find figured and named 

 the Morris Cove variety, p. 97, fig. 93, Diploneis didyma 

 Ehe., var. obliqua, J. Brun, Morris Cove, Conn., U. S. A. 

 Other new varieties credited to Morris Cove are pi. 16, 

 figs. 54 and 55, ''Mastogloia gibbosa, J. Brun," and figs. 

 84 and 85 "Achnanthes curvirostrum, J. Brun;" figs. 86 

 and 87, "Achnanthes manifera, J. Brun;" pi. 17, figs. 99 

 and 100, "Navicula (Lybellus) tubulosa, J. Brun ; " figs. 

 109 and 110, "Hanschia segmentalis, J. Brun." It seems 

 to me that Prof. Brun's figure of "Diploneis obliqua" is 

 not so much constricted or bent as are the typical forms 

 which are abundant in the material. As I cleaned up 

 and examined probably 100 times as much material as 

 that I sent to M. J. Tempere ; and from many other 



