Bacillarieae, Naviculaceae, Navicula. 23 



tenuem attingentibus, 7-7 l / 2 in 10 [ J - ', nodulo centrali oblongo, 

 parvo et angusto. 



Hab. ad litus pr. «Sussex» Anglise (W. Smith), Hiberniae (0' 

 Meara), in mari adriatico et mediterraneo (De-Toni), inter A 1- 

 gas ex Honduras (Janisch). — Adest etiam forma costis non 

 exacte parallelis, subradiantibus (C. Janisch Guano t. I. A, f. 25), 

 fossilis in Guano Peruvia^. — Var. subtilis (Greg.) Cleve Diat. 

 Vega p. 467, Pinnularia subtilis Greg. Diat. of the Clyde p. 16, 

 t. I, f. 19, Rabenh. Fl. Eur. Algar. I, pag. 176, Navicula sublilis 

 Ralfs: valvis anguste subrhombeo-lanceolatis, gracillimis, 85- 

 5-6, apicibus acutatis, costis transversis parallelis, rectis, 9-11 in 

 10 u. , rhaphem attingentibus, nodulo centrali distincto oblongo. Ad 

 oras Scotise in « Lamlash Bay » (Gregory), in mari Arctico (Cle- 

 ve). — Var. angusta Grun. in Cl. et Gr. Arct. Diat. p. 39, Cleve 

 Vega pag. 467: valvis elongatis angustisque, ad 115-7-8, striis 

 transversis parallelis 8 in 10 u. Ad oras Finmarchise, Spitsber* 

 giae aliarumque regionum maris Arctici (P. T. Cleve). 



45. Navicula criophila Castrac. Diat. Challenger p. 26, t. 15, f. 2 45 

 (sub Pinnularia), Notarisia 1889, p. 689. — Valvis anguste rhom- 

 boideis, 76 = 12 u. (ex icone), transverse costatis, costis rhaphem 

 attingentibus, apicibus rotundatis; valvis transverse convexis. 



Hab. in mari Antarctico (Exped. Challenger). 



46. Navicula Allmaniana (Greg.) Ralfs in Pritch. Inf. p. 899, Rabenh. 46 

 Fl. Eur. Algar. I, p. 184, Pinnularia Allmaniana Greg. Diat. 



of the Clyde p. 16, n. 21, t. I, f. 21. — Valvis late elliptico-lan- 

 ceolatis, late marginatis, 40-70 u. longis, apicibus obtuse acuta- 

 tis, striis validis, radiantibus, non granulatis, rhaphem subattin- 

 gentibus, 7'/ 2 -8 in 10 u., nodulo medio valido, terminalibus sub- 

 obliteratis. 



Hab. ad oras Scotiae et in mari mediterraneo. 



47. Navicula Holstii Cleve Diat. Gronl. 1881, pag 11, t. 16, f. 1. — 47 

 Valvis elliptico-ovalibus, 52-64 s 16-20, apicibus subcuneatis, striis 

 subparallelis, 14 in 10 a., indistincte punctatis, rhaphem attingen- 

 tibus, linea laterali submarginali et indistincta interruptis. 



Hab. in aquis dulcibus ad « Ivornak » Groenlandise (N. 0. Holst). 



** Costee rhaphem ubique non attingentes, eae in medio valvse sitae conspi- 

 cue abbreviatse vel deflcientes. 



1. Valvse medio paullo vel non inflatae. 



48. Navicula Brebissonii Kuetz. Bacill. p. 93, t. 3, f. 49, t. 30, f. 39, 4 8 



