Algse, Bacillariepe, Pseudorhapliicle», Fragilariacefe, Synedreee, Synedra. 17 

 evoluta instructse. Facies coiinectivalis ob carinaj prominentiam sub- 

 alata. 



1. Surlrella ovalis Br6b., Consp,, Kuetz., Bacill., p. 61, t. XXX, f. 64, 54 

 var. Sallna (W. Sm.) V. Heurck, Syn., p. 189, t. LXXIII, f. 15. 

 Surirella salina Sm., Brit. Diat., I, p. 34, t. IX, f. 71. Castrac, 

 Atti Acc. Pont. N. Lincei, IV, 18 Marzo, 1877, p. 245. — Valvis 

 ovato-ellipticis mediocribus 12-40 u. longis, costis 5-6 in 10 y.., 

 marginalibus minutis. 



In tripoli ad Montes Labronicos Tuscice (Castrac). 



Pam. DIATOMACE^. 



Gen. Odontidium Kuetz., Bacill., p. 64, emend. Kirchn. 

 Frustula oblongata vel breve-rectangularia in fascias conjuncta 

 vel singula; valvie ellipticae vel lineari-lanceolatae, costatoe ; costae 

 transversae validse, vitta iongitudinali levi interruptse. 



1. Odontidlum Harrisonli W. Sm., Br. Diat.,11, p. 18, t. 60, f. 373. 55 

 Castrac, I. c, p, 7, Pantan., I. c, p. 7. De Toni, Syll. Alg., II p. 639. — 

 Frustulis solitariis vel in fascias breves conjunctis adfixis, valvis 

 15-45 <J.. longis, medio valde inflatis. subcruciformibus, angulis ro- 

 tundatis, costis validis 3,3 in 10 u.. vittam longitudinalem levem 

 angustam medio linquentibus. 



In marga pliocenica inferiore agri Spoletini Umbria^ (Castrac). 

 Odoniidio mutabili W. Sm., quod fossile occurrit ad Lefje in agro 

 Bergomensi et in Africa boreali affine. 



Pam. PRAGILARIACEiE 



Subfam. SYNEDRE^ 



Gen. Synedra Fhr., in Ber. Berl. Akad., 1830, p. 40, Inf., pag. 

 210 (emend.). 



Valvae pro ratione valde elongatae, plus minus lanceolatse vel li- 

 neares, subinde paullulum arcuatse, pseudo-rhaphe seu area longitu- 

 dinali hyalina sa)pius donatae, in nonnullis speciebus pseudo-nodulis 

 centralis terminalibusque instructie. 



I. Synedra salina W. Sm., Br. Diat., 1, p.7I, t. XI, f. 88. Castrac, Atti 55 

 Acc Pont N. Lincei, IV, 18 Marzo, 1877, p. 245. — Valvis lan- 



