18 Transactions of the Society. 



forms noticed which differs from any of WoUe's figures in 

 not tapering so much towards the ends. Fig. 11. 



Is this species correctly synonymized with D. Ehrenhergii Ralfs ? 

 After examining thousands of the latter in my own British gatherings, 

 I have never yet seen an example without the minute tubercles at the 

 ends, and these are always absent in the American examples, which 

 are also generally stouter. 



Calocylindrus CucurUta (Breb.) Kirch. I have given a 

 figure of this, as WoUe's figure is so different from the 

 examples I saw, which are like our British ones both as to 

 form and size. Fig. 15. 



C. curtus (Breb.) Kirch. 



C pseudo-connatns Nord. 



Cosmarium Cordanum Breb. Occasionally seen. As the 

 figures published successively by Joshua, Turner, and 

 Wolle are not from the U.S., I have appended a drawing, 

 fig. 23 ; I believe this is new to the U.S. Flora. 



Cosmarium Cueumis Corda. 



C. granatum Breb. 



G. tinctum Ealfs. 



C. nitidulum De Not. 



C. pseudonitidulum Nord. 



C. Iseve Eaben. 



C. Iseve Eaben., var. septentrionale Wille. This will be a new 

 variety to the U.S. Breadth 15 /n, length 20 fj,. 

 Fig. 19. 



C. Meneghinii Breb., forma octangularis Wille, yS simpUcissi- 

 mum Wille. A form like the figure of the shaded semi- 

 cell in ' Bidrag til Kundskaben om Norges Ferskvandsalger,' 

 pi. i, fig. 11. Four different examples are shown in 

 Fig. 7. 



C. undulatum Corda, var. crenulxtum Wolle. Breadth 22 fi. 



C. Naegelianum Breb. 



C. pyramidatum Breb. 



C galeritum Nord. 



C. triplicatum Wolle. Frequent. 



C punctulatum Breb. Plentiful. 



G. Botrytis Meneg. 



C. octhodes Nord. 



G. orhiculatum Ralfs. 



G. amoenum Breb. 



G. Phaseolus Breb. 



G. pygmeeum Arch. ? This is certainly a different Cosmarium 

 from any other in the hst, and to me it seems nearest the 

 species to which I have doubtfully referred it, though it 

 differs in some respects from the figures which I have seen. 



