Bacillarieae, EiinotiacecTc, l-lunoti.i. 801 



^ Latus inferius valvoi (ventrale) concavura. 



:i8. Eunotia Triodon Ehr. Inf. p. 192, t. 21, f. 24, W. Sm. Br. Diat. ^i^o 

 I. p. 10, t. 2, f. IS, KuGtz. Bacill. p. 37, t. V, f. 25, Eunoiia di- 

 zyga Elir. Ainer. p. 126, t. 2, I, f. 8, Rabenh. Siissw. Diat. p. 17, 

 t. i, f. 30?, Kuetz. Bacill. p. 38, t. 29, f. 51 ?, Himaniidium Iriodon 

 Perty Kl. Lebensf. t. 17, f. 5 (forma robustior)? — Valvis 40-60 

 [}.. longis, dorso alte convexo tridentato, ventre valde concavo, slriis 

 15-15^2 in 10 u. 



Hab. in rivulis raontanis Lapponie (Grant), HelvetijE (Perty); 

 ad «Cayenne» Gujana^ (Ehrenberg); fossilis in Suecia et Finlan- 

 dia (Khrenberg). — Huc pertinet Eanolia triglyphis Ehr. 



39. Eunotia tridentula Ehr. Verbr. p. 126, t. 2, 1, f. 14, Kuetz. Ba- 3i8i 

 ciil. p. 38, t. 29, f. 60, Rabenh. Siissw. Diat. p. 17, t. I, f. 16, 

 Alg. 31, 50 et n. 1022^ Bac. exs. n. 31, Greg. Micr. IV, t. 1, f. 1, 

 Grun. in Wien. Verh. 1862, p. 336, t. VI, f. 13, Grev. in Ann. 

 Nat. Hist. 2 ser., XV, t. IX, f. 2. — V. minimis, gracilliraa, ven- 

 tre concaviusculo, dorso triundulato-dentato, apicibus obtuso-rotun- 

 datis, leniter recurvis. 



Hab. in fontibus, rivulis e planitie usque in regionem raonta- 

 nam et subalpinam passim per Austriam, Germaniam, Helvetiam, 

 Gailiam et Angliam, etc. ; in America (Ehrenberg). 



40. Eunotia Elephas Ehrenb. Amer. p. 126, tab. 1, IV, f . 5 (pessuma), 3182 

 Grun. in Wien. Verhandl. 1862, p. 334, Rabenh. Suss. Diat. p. 77 



t. I, f. 27, Kuetz. Bacill. p. 37, tab. 29, fig. 64. — E majoribus, 

 valvis striatis, latissimis, curvis, apicibus late rotundatis, dorso tri- 

 dentato. 



Eab. in Brasilia (Ehrenberg). 



3. Crenae quatuor. 



41. Eunotia Tetraodon Ehr. Infus. p. 192, t. 21, f. 25, W. Sm. Br. 3183 

 Diat. I, p. 16, t. 2, f. 19, Rabenh. Siissw. Diat. t. I, H, f. 11, Alg. 



n. 1402, Himantidium Tetraodon Br6b. in Kuetz. Bacill. t. 5, f. 26, 

 Sp. p. 10 — Frustulis nonnunquam 3-4-conjunctis, valvis ad 45 

 a. longis, dorso elato 4-undulato, apicibus rotundatis. 



Hab. in fossis prope « Falaise )) Galliae (Brebisson), in stagnis 

 prope «Jauernick)) Lusatice superioris (Rabenhorst), pr. uSchlad- 

 ming)) Stiriae, (G RUNOw), locis variis Britanniae (W. Smith, Johnson, 

 DiCKiE, Ralfs, Williamson); fossilis in Finlandia (Ehuenberg). 

 42. Eunotia quaternaria Ehrenb. Amer. p. 126, tab. 2 I, f. 13 (vix 3i84 



