212 Bacillarieee, Naviculaceae, Stauroneis. 



moniliformibus, distantibus, inter has subtilioribus obsolete puncta- 

 tis; frustulis a latere visis late linearibus, utroque fine truncatis. 

 Hab. in paludibus turfosis Saxoniae, Lusatiaa inferioris (L. Ra- 

 benhorst). 



38. Stauroneis minutissima Lagerst. Diat. Spetsb. p. 39, t. 1, f. 13, 904 

 Hedwigia 1874, p. 120. — Frustulis e facie connectivali visis an- 

 guste rectangularibus, angulis obsolete rotundatis; valvis oblongis 



vel oblongo-ellipticis. 12-24*5-7; nodulis ?; rhaphe e lineis 



duabus rectis composita; striis transversis rectis, tenuissimis, no- 

 dulum centralem versus convergentibus, 19-21 in 10 u.., centralibus 

 abbreviatis; area longitudinali lineari angustissima, stauro lineari 

 vel margines versus leniter dilatato, hos non attingente. 



Hab. in aqua dulci ad « Cap Thordsen, Parrys o, Nord Cap, 

 Liefde B, Amsterdam on, Kobbe B, Isfjorden » Spetsbergiae (Lager- 

 stedt). — Color frustuli exsiccati pallidissime lutescens. 



39. Stauroneis pachycephala Cleve On some new or little known 909 

 Diatoms p. 15, t. III, f. 43, C. et M. Diat. n. 197. — Valvis linea- 

 ribus, 55 * 9, medio apicibusque gibbosis, apicibus late rotundatis 



et capitatis; stauro margines attingente, rhaphe recta; nodulis ter- 

 minalibus in directionem oppositam revolutis; striis obliquis subti- 

 lissimis, circiter 29 in 10 u., rhaphen attingentibus. 



Hab. in aqua dulci vel subsalsa in fl. «Baakens River» dicto, 

 ad uPort Elisabeth» Africas australis (W. Joshua). 



40. Stauroneis exilis Kuetz. Bac. p. 105, t. 30, f. 24, Grun. Alg. No- m 

 vara p. 20, Rabenh. Siiss. Diat. p. 48, t. 9, f. 11. — Valvis mi- 

 nutissimis, 10-11 u. longis, elliptico lanceolatis, breviter rostellatis; 

 strii.s paullo conspicuis. 



Hab. in aqua dulci Antillarum (Kuetzing), inter Diadesmi- 

 dem peregrinam in aquario Victoricv regitv in hortu Kewensi 

 Angliae (Grunow), in lacu uWahiria» insulae «Tahiti» (Exped. No- 

 vara). — Var. ?constricta Grun. 1. c: valvis iri media parte obso- 

 lete constrictis. In lacu « Wahiria » insulae «Tahiti» (Frauenfeld) ; 

 inter Nitzschiam Tryblionellam in aquario Victoricr< regicv in 

 horto supra memorato (Grunow), inter A lgas varias aquse dulcis e 

 Chili AmericaB australis (Gaudichaud). 



41. Stauroneis Keufleriana Grun. in Wien. Verhandl. 1863, p. 155, 907 

 t. XIII, f. 10, Cleve et Grun. Arct. Diat. p. 41 (sub uomine Sfau- 

 roneidis Heufteri Grun.). — Minor, valvis oblongis, 22-30^7,5-9, 

 sub polis constrictis, apicibis dilatatis capituliformibus subtruncatis, 



