6G 



Navicula? constricla C. G. E. 1888, Inf. pag. 188, Taf. XXI, 

 fig. XVII = B. palea P. A. C. N. 



Navicula? undiilata C. G. E. i838, Inf. p. 187, Taf. XXI, f. XVI 

 = B. palea P. A. C. N. 



I bave not seen this form [Denticida palea) as living so cannot 

 judge of its belongings, but as it does no occur as frequent as 

 Epìlhemia, with is very common, I tbink Epitlienna was developed 

 first and tben Denticula. 



Denticula occurs in salt water on the Pacific coast and was 

 brougbt there from the Yellowstone Park, or from Texas, wben it 

 is found also in the Dockum beds in quantity. And the Bacillaria 

 are likewise fresh water of Yellowstone Park but 1 bave not it from 

 the salt or brackish lakes of the Occidental Sea. Epìlhemia occurs 

 also as a marine form and become so from the fresh water form 

 is brougbt there likewise. It occurs on the Atlantic side of the con- 

 tinent of North America at Midland Beach, Staten Island, New^ York. 

 It is placed in Nil'^schia, or rather Hanischia, by student of the Ba- 

 cillaria, as Hanischia? marina by A. Grumow. So although is with 

 the forms (rspecies) of Bacillaria from Woolman, it should be Den- 

 ticula palea and not be Denticula valida. 

 Epithemia gibba C. G. E. 



— gibba var. parallela A. G. 



— T^ebra C. G. E. 



— gibberiila var. producta A. G. 



— constricla A. B. 

 Encyonema ventricosum T. R. 

 Gomphonema clavatum C. G. E. 

 Fragilaria virescens T. R. 

 'Navicula major F. T. K. 



— viridis F. T. K. 



— rostrata C. G. E., forma minor. 



— bohemica C. G. E. 



— elliptica var. minutissima A. G. 



— decurrens F. T. K. 



— Brèbissonii F. T. K. 



— formosa F. T. K. 



— varians W. G. 



