147 



styliformi - productis , costis in 0,001" 16 — 20, striis tenuissimis. v. i. 



Long. 0,0007—0,0008". 



Hab. in aquis stagnantibus propc Viennam Austriae, prope Vercelli 

 Sardiniae, Aix, Toulon Galliac. 



XXIII. Tryblioiiella (Sm. 1853.) Grunow emend. 

 (1862): Frustula quadrangula singula vel geminatim conjuncta, valvis 

 carina margini alteri approximata instructis, transverse striatis vel 

 striato-punctatis , plerumque semel longitudinaliter plicatis , costis vel 

 punctis carinalibus obsoletis; membrana connexiva plus minus evoluta. 



(Nitzschiae et Synedrae spec. Aut.). 



a. Striae validae, obsolete punctata. 



T. Hantzschiana Grun. (in Wien. Verh. 1862. p. 552. T. XII. 

 F. 29. Nitzschia Tryblionella Htzsch. in Rabenh. Alg. B". 984.). T. 

 magna, late lineari-oblonga, ad utrumque finem parum attenuata, apici- 

 bus obtuso - rotundatis ; valvis lanceolatis , utroque fine acutatis ; striis 

 transversis perviis 16 — 18 in 0,001". v. s. 



Long. » 24— '/2o'" = 0,0036—0,0045", lat. * vt"' = 0,0010". 



Hab. inter alias Diatomeas in paludibus prope Dresdam Saxoniae 

 (Hantzsch) ; in thermis Budae, in stagnis lacus „ JSTeusiedler See" et in 

 lacuna aqua calida repleta prope Viennam Austriae (Grunow) ; prope 

 Falaise Galliae (De Brebisson). 



T. Victoriae Grun. (1. 1. F. 34. Eabenh. Alg. N. 1502.). T. ro- 

 busta, late linearis, utroque fine late rotundata, medio saepius leviter 

 constricta; valvis late lineari - oblongis , apicibus obtuso-conicis; striis 

 punctatis perviis 18 — 22 in 0,001". v. v. 



Long. » ,'oe— l V" = 0,00157 — 0,00185", lat. valvarum V133 = 

 0,00067". 



Hab. in aquis calidis machinarum vaporearum prope Dresdam 

 (Hantzsch primo detexit) ; in cysterna Victoriae regiae horti „Kewgar- 

 den" Londinensis (Grunow). 



T. navicularis (Surirella navicularis Breb. in Ktz. Spec. Alg. p. 36. 

 Tryb. marginata Sm. Diat. I. p. 35. T. X. F. 76.). P. oblonga, utro- 

 que fine dilatata , truncata ; membrana connectiva lata longitudinaliter 

 striata; valvis ovato-lanceolatis , apicibus acutatis, striis transversis 

 validis perviis 18 in 0,001". v. s. 



Long. 1/52—1/37"' = 0,0017—0,0024". 



Hab. in aquis submarinis, nec non ad oras Angliae: Hull (Norman), 

 Lewes (\V. Smith) , Liverpool (Comber) , Belfast (Dickie) , Newhaven 



10* 



