

364 Bacillarieae, Cymbellacese, Cymbella. 



rium unilateralem ostendente cincta, leniter arcuata; striis circi- 

 ter 8 in 10 p., crassiusculis, subtilissime transverse divisis ; frustu- 

 lis (in vivo) stipitatis, stipitibus ssepe intricatis, simplicibus. 



Hab. in aquis dulcibus Germaniae (Kuetzing, Rabenhorst), Gal- 

 lise (Brebisson), Italiae (De-Toni, Lanzi), Anglite (W. Smith), Helve- 

 tise (Brun), Belgii (Van Heurck), Galiciae (Gutwinski, Raciborski), 

 Poloniae (Cybulski, Zalewski sec. Gutwinski), montium Tatrensium 

 (Schumann, Raciborski sec. Gutwinski), Bosnice (Schaarschmidt), 

 Hispaniae (Truan y Luard), Americaa borealis et centralis (Ehren- 

 berg). — Var. parva (W. Sm.) V. H. Syn. p. 64, t. 2, f. 14, Typ. 

 n. 23, Cocconema parvum W. Sm. Br. Diat. I, pag. 76, f. 222, 

 Pritch. Inf. p. 878, t. 7, f. 47, A. Schm. Atlas t. 10, fig. 14-15, 

 Sm. Sp. T. n. 85, Grun. Diat. Franz Jos. Land p. 45, t. I, f. 9: 

 jninor, oblonga, 30-50 u. longa, ventre leniter inflata, apicibus acu- 

 tiusculis paullo porrectis; striis granulatis, 8 in 10 u. ; puncto so- 

 litario unilaterali prope nodulum centralem absente. In aquis dul- 

 cibus Angliae, Belgii, Galliae australis, Austrise super. et inferioris, 

 Hungariae, Galiciae, montium tatrensium, Poloniae, ad «Franz Josefs 

 Land» (Grunow). — Huc forte pertinet: Cymbella Smithii Ra- 

 benh. Fl. Eur. Algar. I, p. 80, Cymbella helvetiea W. Sm. Br. 

 Diai I, p. 18, t. 2, f. 24: gracilis, 40-70 u. longa, nonnunquam 

 elongata, apicibus acutiusculis. In aqua dulci per totam Europam. 



58. Cymbella arctica Lagerst. in A. Schm. Atlas t. 10, f. 12, Cym- \m 

 bella variabilis var. arctica Lagerst. Diat. Spetsb. 1873, p. 44, 



t. 2, f. 21. — Frustulis e facie connectivali visis lanceolatis, api- 

 cibus truncatis, 51-70^13-15; valvis arcuatis, apicibus leviter 

 recurvatis, late truncatis, margine dorsuali rotundato, ventrali con- 

 cavo, medio leviter inflato, nodulo centrali rotundato-oblongo, no- 

 dulis terminalibus parvis rotundatis; rhaphe arcuata, marginem 

 centralem versus concava, e lineis duabus subsigmoideis composita; 

 striis transversis validis, non punctatis, ad rhaphen perpendicula- 

 ribus, dorsualibus 6'/ 2 -7 l / 2 , ventralibus 7'/, in 10 u., area longi- 

 tudinali sublineari, arcuata, circa nodulos leviter dilatata. 



llab. in Spetsbergia et « Beeren Eiland » (Lagerstedt, Gruend- 

 ler). — Color frustuli exsiccati pallide lutescens. 



59. Cymbella Botellus Lagerst. in A. Schm. Atlas t. 71, f. 39, Cijm- \aaq 

 bella variabilis var. Boiellus Lagerst. Diat. Spetsb. 1874, p. 44, 

 tab. 2, f. 22, Cocconema Botellus Lagerst. in Cl. et Moell. Diat. 

 n , 59 # — Frustulis e facie connectivali visis sublinearibus, apici- 

 bus rotundatis, marginibus lateralibus leniter convexis, 24-34 s 



