226 Bacillariese, Naviculacese, Ampliipleura. 



7. Schizostauron tatricum (Gutw.) De-Toni in Nuova Notarisia 1890, 982 

 p. 196, Slauroneis talrica Gutw. Mat. fl. Galicyi 1890, pag. 24, 



t. 1, f. 20. — Valvis lineari-ellipticis, 45-48 s 10,5, sub apicibus 

 9 u.. latis acute rotundatis lenissime constrictis, area transversa 

 (stauro) margines versus parum dilatata ibique quater digitato- 

 incisa, linea media longitudinali recta triplici, nodulis terminalibus 

 perparvis costaque transversa prseditis; striis transversis subtilibus, 

 11,9 in 10 u.., convergentibus, rhaphen attingentibus; facie con- 

 nectivali lineari-oblonga, utroque flne truncata. 



Hab. pr. uKurtkowiec» in montibus Tatricis (M. Raciborski). 



8. Schizostauron? andicolum Cleve Diat. Gronl. och Arg. Republ. 1881 983 

 p. 12, t. 16, f. 8. — Valvis linearibus, 36 ~ 7, elongatis, convexis, 

 nodulis terminalibus in directiones oppositas vergentibus; striis trans- 

 versis 22 in 10 u., subparallelis. 



Hab. in aquis dulcibus «Sierra de Velasco» in Republica Ar- 

 gentina Americse australis. 



STAUROGRAMMA Rabenh. [1853] Sussw. Diat. p. 50 (Etym. stauros 

 crux et gramma linea, littera), De-Toni Osserv. tasson. Bacill. 1890, 

 p. 896. — Est Stauroneis valvis striis decussatis iustructis. 



Obs. Genus (aptius meram Stauroneidis sectionem sisteus) huc- 

 usque specie unica institutum, sed accedunt verisimiliter nonnullse 

 Stauroneidis species. 



1. Staurogramma persicum Rabenh. Siissw. Diat. p. 50, Pritch. Inf. 984 

 p. 915, t. 8, f. 36, Stauroptera decussata Rabenh. 1. c. t. 9, f. 14. — 

 Valvis ovato-lanceolatis, 50^20, acuminatis sed obtusulis, vitta 

 transversali lata, longitudinali paullo angustiori. 

 Ilab. in Persia australi (Rabenhorst). 



AMPHIPLEURA Kuetz. [1844] Bacill. p. 103, Spec. Alg. p. 88 (Etym. 

 amphi circa et pleura latus) Rabenh. Fl. Eur. Algar. I, pag. 143, 

 Grun. in Wien. Verhandl. 1862, p. 467, V. H. Syn. p. 113, De- 

 Toni Osserv. tasson. Bacill. 1890, p. 902. — Frustula fusiforraia, 

 libera, plerumque recta; valvae anguste lanceolata?, carina mediana 

 prasdita\ prope utrumque marginem carina instructse; nodulus cen- 

 tralis obsoletus, noduli terminales valde elongati ; striae trans- 

 versae et longitudinales subtilissimse *). 



*) Strise fegre in granulos solubiles. Cf. praecipue Van Heurck Note sur 

 la photographie des perles de 1'Amphipleura pellucida, Les perles de PAm- 

 phipleura pellucida, Note sur la resolution en perles de 1'Amphipleura pellu- 

 cida Kuetz. et sur ki nature reelle des stries des Diatomees 1884-85. 



