45 



At any rate it shows that C Sciifelliiiii, a marine species, or form, can 

 occur in fresh water. Another example of the Baciilaria in fresh 

 water. 



Cyclolclhi Kiiet\ingiana, G. II. K. T. is found sparinglv. 

 Cyniatopìeiira elHplica A. B. This is Siirirella clliptica A. B. 

 i838, in Kuetzings Bac. 1844, pag. ói, T. 28, fig. 28, S. oophena 

 C. G. E. 1843, Ab. pag. i36, T. Ili, v. i, A. Grunow in Verh. der. 

 k. k. Zo. bot. Ges. XII. Band, 1862, pag. 462 and 4Ò4 makes four 

 species. Var. a. genuina, including Surireìla ellìptica, S. oophenìa, 

 Cvìnatopìeura cUiptìca and Siirirella Kuel\ingii Pcrty kleinsl. Leb.XVII, 

 2. var. ovata including S. oviun. Na. and Cynialopleitra clliptica var. 

 rhoniboidcs including Surirella plicata and Cyuiatopleura nobilis, Hant. 

 and var. constricta A, G. Var. constricta, A. G. is without a centrai 

 constriction showing it passes into Surirella solca, F. T. K. 1844, 

 Bac. pag. òó, T. 3, fig. LXI, which includes Frustulia quinquepun- 

 ctata, F. T. K. i833, Syn. fig. 28, Navicula librile, C. G. E. i83i, 

 pag. 81 and Surirella solca A. B. i838, Con. pag. 1 7. So that it can 

 be without a constriction and vvith it, and rounded ends and pro- 

 duced ends. It can bc also spiraly bent and fiat. I think it is a Ni- 

 t~scliia where it passes into Canipylodiscus by C. spiralis. And this is 

 a Surirella. 



Cymbella cistula H. 



Dia toni a anceps C. G. E. 



Epithcmia gibba C. G. E. 



— turgida C. G. E. 

 Eunotia gracilis C. G. E. 



— robusta J. R. 

 Gomphonema augur C. G. E. 



— constrictum C. G. E. 



— montanum A. G. 



Hant^schia {Amphioxys var.?) elongata A. G. 

 Melosira granulata C. G. E. 

 Meridion eir ciliare C. A. A. 

 Navicula ambigua C. G. E. 



— americana C. G. E. 



— amphigomphus C. G. E. 



— amphirynchus C. G. E. 



