Algse, Bacillariese, Pseudoiiiaphidece, Eunotiacese, Epithemia. 21 



lineari-lanceolatse, pseudo-rhaphe et striis transversis moniliformibus 

 costisve instructas. 



1. Rhabdonema adriaticum Kuetz., Bacill.,p. 126, t. XVIII, f. 7. Ca- gs 

 strac, Atti Acc. Pont. N. Lincei, 18 Marzo, 18^7, p. 245. De Toni, 

 Syll. Alg., II, p. 764. — Valvis angustis, lineari-lanceolatis, apici- 

 bus levibus, costis spuriis 8-9 in 10 a. in granulos solutis, dissepi- 

 mentis foramina 3 praebentibus ; costis transversis et pseudo-rhaphe 

 distinctis; frustulis e facie connectivali visis 60-90 • 200, dissepimen- 



ta numerosa in interstitiis, costis transversis 6-8 in 10 u.. donata 

 praebentibus, striis intercostalibus 2-3, subtilissime punctatis. 



In tripoli ad montes Labronicos Tuscice {Gashrac). — Differt a 

 Rh. arcuato quod etiam occurrit fossile in Italia, imprimis disse- 

 pimentis terperforatis. 



2. Rhabdonema arcuatum (Lyngb.) Kuetz., Bacill., p. 126. t. XVIII, 69 

 f. 6. Nicotra. Boll. Soc. geol. it., I, 1882, p. 2. De Toni, Syll. Alg., 



II p. 761. Dmtoma arcuaium Lyngb., Hydroph. Dan., p. 180, t. LXII. 

 Tessella catena Ehr., Inf., f. 7. et Mikrog., t. XXII, f. 65. — Valvis 

 lanceolatis, 40-70 ,a. longis, apicibus levibus, pseudorhaphe conspicua, 

 costis 8 in 10 a., cum seriebus margaritarum validarum alternan- 

 tibus, dissepimentis foramine singulo pertusis ; frustulis e facie con- 

 nectivali visis dissepimenta numerosa in interstitiis costas transver- 

 sas 7-7,5 in 10 a. proebentia ostendentibus, seriebus binis granulorum 

 subtilissimorum intercostalibus alternis. 



In schisto siliceo tortoniano « Messina» insuhe SicilicB (Nicotra), 

 «Caltanisetca» insulae Sicilice (Ehr.) — Verisimiliter huc pertinet 

 Surirella sicula Ehr., Mikrog., t. XXII, f. 58 (valva) ex eodem loco 

 quo species inventa fuit. 



Fam. EUNOTIACEiE 



Gen. Epithemia Breb., Consp., p. 16 



Frustula solitaria, epiphytica, ventre (concavo) affixa, e facie con- 

 nectivali visa linearia, medio plus minus tumida. Valvas arcuatse in- 

 terius costis validis transversis, exterius striis granulatis punctatisve 

 instructae, nodulis carentes. 



1 Epithemia ocellata (Ehr.?) Kuetz., Bacill., p. 34, t. XXIX, f.57. Ca- 70 

 strac, 1. c, p. 6. Pantan., 1. c, p. 7. — E minoribus, valvis 25- 

 45 a. longis, plano-convexis, semilunatis, utroque polo aequabiliter 



