514 Bacillarieae, Nitzschiacean, Nitzschia. 



Hab. in Finmarchia, a.l « Lysekil » (Grijnow). — Membrana 

 couiiectivalis longitrorsum striata. An prsecedentis varietas? 



55. Nitzschia bilobata W. Sm. Br. Diat. I, p. 42, t. 15, f. 113, H. L. 2049 

 Sra. Sp. T. n. 335, Cl. et Grun. Arct. Diat. pag. 80, V. H. Syn. 



p. 175, t. 60, f. 1, Amphiprora latestriata Breb. in Kuetz. Spe- 

 cies p.'93?, Nitzschia latestriata Rabenh. Fl. Eur. Algar. I, p. 154. 

 — Valvis lineari-lanceolatis, 80-150 u.. longis, raedio constrictis, 

 sub polis subito attenuatis, apicibus acute conicis, carina subcen- 

 trali; striis transversis subtilibus, circiter 17-19 in 10 y., punctis 

 carinalibus ^V.-l in 10 ^jl. , transverse striolaeforrai-prolongatis, 

 duobus raediis "subremotis et inter se vestigiura pseudonoduh lin- 



quentibus. 



Hab. in aquis salsis fere totius Europoe ; inter Algas e Brasilia 

 et ex insula Societatis (Exp. Novara). - Var. minor Grun. in 

 V. H. Syn. t. 60, f. 2-3: parva, valvis 50-70 a. longis; striis 23- 

 27 in 10 fx. Cum typo. 



56. Nitzschia lesinensis Grun. in Ci. et Gr. Arct. Diat. p. 80, C. et M. 2050 

 Diat. n. 208. — Frustuiis ex toto 85-105 :j 26-31, superficie obscure 

 punctatis, punctis subinde 11 in 10 y.., raro punctuatione obscu- 

 rissima punctis indistinctis; punctis carinalibus breve striolreformi- 



bus, 3-6 in 10 ^. 



Hab. in mari adriatico et mediterraneo, raro. — Var. dimmuta 



Grun. l.c: multo rainor; valvis 42-44 := 15, subtilissime striatis; 



striisultra 36 in 10 a., forma et punctis carinalibus ut in typo. 



Sierra Leone. 



57 Nitzschia Mitcheiliana Greealeaf in B. J. N. H. 1865, p. 107, Cl. ^Oai 

 et Grun. Arct. Diat. pag. 80, t. 5, f. 97. - NitzschicB lesinensz 

 Grun. similliraa, punctis carinalibus vero alternatim breve puncti- 

 formibus et valde elongatis (ad 4 a. longis); valvis 100-115 ::: 13-16; 

 striis trasversis delicatissimis, 28-29 in 10 u.. 



Hab. in America boreali (Greenleaf), in Spetsbergia, in raari 

 Kariano, in Finmarchia (Grunow). ^ 



58 Nitzschia vermiculata Castrac. Diat. Challenger pag. 68, t. lo, 205. 

 f 12 Notarisia 1889, p. 689. - Magna, triplo longior quara latior, 

 177 J50 (ex icone), latere carinali per constriction era angularera 

 bilobato; carina granulis distinctioribus in raedio signata; apicibus 

 cuneato-obtusis ; valvis verraiculatim striatis. 



Hah. ad «Zcbu» in uiari Philippinarura (Exped. Challenger). 



59 Nitzschia granuiosa Leud.-Fortm. Diat. Ceyl. p. 40, t. 3, f. 37. 20.:^ 

 ^ Valvis leniter pandura)forraibus, 104:^48, tota superficie stnis 



