742 Bacillarieae, Striatellaceae;, Diatomella. 



II. Genera marina (species nonnullae etiam fossiles). 



A) Dissepimenta parietalia tantum duo in unoquoque frustulo. 

 Grammatophora Elir. — Dissepimenta varie undulata, medio perforata. Valvae 



striato-punctatc-e, ecostat8e(Frustula rectangula,catenas solutas eflformantia). 

 ?Climaconeis Grun. — Dissepimenta scaliformia; valv?e striato-punctatas, 

 ecostatse (Frustula bacillaria, libera?). 



B) Dissepimenta parietalia plura in unoquoque frustulo. 

 -J- Valvae costatse et striato-puuctatje. 



Rhabdonema Kuetz. — Dissepimenta plana, circuitu celluloso-punctata ; valvae 



subcostatae, inter costas punctato-striatae. (Frustula rectangula, in fascias 



longiores stipitatas conjuncta). 

 '^ Climacosira Gvxin. — Dissepimenta numerosa, irregulariter scaliformia; 



valv3e lineares, costat* (?). (Frustula tabulata, rectangula, in fascias con- 



juncta). 

 •]"]- Valvce ecostatae. 

 Strialella Ag. — Dissepimenta annuliformia, plana, haud interrupta; valvse 



lanceolatse, striato-punctatae, ecostatse (Frustula tabulata, rectangula, in 



fascias stipitatas conjuncta). 

 Atiheya West. — Zona connectivalis ad 4 angulos spinas vel setas longas 



subtilesque gerens (Genus ad Chcetoceraceas quodammodo transiens). 



? Moelleria Cleve. — Frustula cuneata in spiralem seriem conjuncta; valvae 

 ovales, pseudonodulo centrali instructae et in processos 2 inaequales desi- 

 nentes; zona connectivalis crebre costata vei plicata [Habitus Eucampice] , 



? Lauderia Cleve. — Frustula cylindracea, annulata; valv« orbiculares, prope 

 marginem processibus numerosis brevibus piliformibus vel spinis instructse 

 et per has appendices conjunctae [Habitus quasi Stephanopyxidis]. 



DIATOMELLA Grev. [1855] in Ann. Nat. Hist. ser. 2, vol. XV, t. IX, 

 (Etyni. a Diatomate, BaciUariacearum genere), Rabenli. Fl. Eur. 

 Algar. I, p. 300, Brun Diat. Alp. p. 129, De-Toni Osserv. tasson. Ba- 

 cill. 1890, p. 907, Grammatophorce sp. W. Sm., Disiphonia Elirenb. 

 [1854] Mikrogeol. sec. Pritchard. — Frustula quadrangula, solita- 

 ria vel in fascias conjuncta, dissepiraentis duobus pianis bis terve 

 perforalis instructa; valvse oblonga^ vel lanceolatae, ventricosge, trans- 

 verse striatae, non costatae, nodulo centrali instructa^, apicibus ro- 

 tundatae. Facies connectivalis costis duabus longitudinalibus, vali- 

 dis, rectilineis, centro apicibusque interruptis donata, 



1. Diatomella Balfouriana Grev. in Ann. and Mag. Nat. Hist. ser. ^m 

 2, XV, 1855, p. 259, t. IX, f. 10-13, Pritch. Inf. p. 810, t. 4, 

 f. 51-52, Rabenh. Fi. Eur. Algar. I, p. 300, f. 78, Grun. in Wien. 

 Verhandl. 1862. p. 409, Novara p. 5, Brun Diat. Aip. et Jura p. 129, 



