Bacillarie?e,' Eunotiaceae, PseUdo-EUiiotia. 809 



liiiearis, 40-75 y.. longa; valvis angustissirne laiiceolatis, arcuatis, 

 apicibus capitatis productis, transverse delicate striatis, striis 17-19 

 in 10 u.. 



Hab. in aqiiis dulcibus Helvetiae (Nabgeli); prope Vindobonara 

 Austria' (Grunow) ; in India orientali (Grunow). 



3. Pseudoeunotia pachycephala (Kuetz.) Grua. Diat. ins. Banka p. 8 "^243 

 (sub Ceratoneide), ]'Jano/ia pachyoephaUi Kuetz. Sp. p. C, Syne- 

 dra flexuosa var. angasta Breb., Symdra pachycephala Ralfs 



in Pritch. Inf. p. 786? — E facie counectivali visa linearis, gra- 

 cilis, 110 :i o-3,5, valvis eviter arcuatis, vi.\ 3 y.. latis, utrinque 

 in capituluin ciavifonne obtusuin dilatatis ; striis transversis 16-17*/., 

 in 10 a. 



tiab. in aquis dulcibus prope «Falaise» Galliai (De Brebisson) ; 

 prope Vir.dobonam Austriae (Grunow). — A Pseudoeunoiia lunari 

 (Ehr.) Grun. differt valvis linearibus" ieviter capitato-incrassatis. 



4. Pseudoeunotia arcuata (Naeg.) Grun. Diat. ins. Banka p. 8 (sub .'^244 

 • Ceratoneide), Synedra arcuata Naeg. in Kuetz, Spec. Alg. p. 890, 



Rabenh. Fl. Eur.' Algar. I, p. 129. — E facie connectivali visa li- 

 nearis, utroque fine truncata: valvis linearibus, ad 90 u.. longis, cur- 

 vatis, apicibus rotundatis, striis delicatissimis, circiter 22-24 in 10 a. 

 tinb. in aquis' dulcibus Helvetia^ (Naegeli) ; inter Sp h ag n u m 

 prope Holmiam Sueciae (N^yMAN). 



5. Pseudoeunotia biceps (Ehr.) Grun. Diat. ins. Banka p. 8 (sub Ce- 3245 

 ratoneide), Eunotia biceps Ehr. .\iner. t. 1,1, f. 24, Kuetz. Bacill. 



p. 37, t. 29, f. 65, [non Ehr. Mikrogeol. t. 17, I, f. 25 A, t. 3, II, f. 12, 

 I, f. 12, t 33, IX, f. 2, t. 2, III. f. 18 a-b:\G:mes hx formam ro- 

 bustiorem 'reprcBsentant], Synedra flexuosa W. Sm. nec Breb., 

 Exilaria flexa Br6b.' sec. Kiietzing. — Valvis anguste lineari- 

 bus, curvatis, transverse striatis, apicibus rotundatis paullulum re- 

 volutis; striis transversis 16-17 in 10 a. 



Hab. in aquis dulcibus prope «Falaise» Galliae (De Brbbisson, 

 Lenormand , Grunow) ; in America boreali et insulis Maluinis 

 (Ehrenberg). — A Pseudoeunotia pachijcephala (Kuetz.) Grun. 

 differt statura majori, facie coniiectivali multo latiore, valvis e 

 medio versus apices capitato-incrassatos paullulura angustatis. 



6. Pseudoeunotia flex!i0sa (Breb.) Grun. Diat. ins, Banka p. 8 (sub 3?^6 

 Ceratoneide), Synedra fiexuosa Br6b. teste Kuetzing, non Synedra 

 flexuosa W. Sm., Eunotia flexuosa Kuetz. Sp. p. 6, Cfr. V. H. 

 Syn. p. 144, t.- 35, f. '9-10. — E facie connectivali visa elon- 

 ^ata, 15-30 a. Tonga, recta, 6xacte linearis, membrana connectival j 



