KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 51 



12 (ends) in 0,oi mm. almost parallel. Puncta about 12 in 0,oi mm. forming slightly undulating 

 longitudinal rows. — Diatomiste II p. 15 Pl. I f. 13. 

 Marine: CMna (Van Heurck Coll.)! 



55. N. doljensis Pant. (1886). — V. lanceolate. with subacute ends. L. 0,i42; B. 0,o.33 mm. 

 Median line with approximate central pores. slightly undulating. Axial area indistinct, central 

 very small, orbicular. Strise 9 in O.oi mm., transverse throughout, coarsely punctate, puncta about 

 9 in 0,01 mm. — Pant. I p. 24 Pl. XXIV f. 219. 



Marine: Hungary, fossil (Pant.). 



56. N. Brnnii Pant. (1886). — V. lanceolate, with subobtuse ends. L. 0,o84; B. (1,02: mm. 

 Median line straight, with approximate central pores. Axial area indistinct. central a short and 

 narrow transverse fascia. Striai 9 in 0, 01 mm. slightly radiate in the middle, slightly convergent 

 at the ends, coarsely punctate. — Pant. I p. 23 Pl. XXIV f. 217. 



Marine: Hungary, fossil (Pant.). 



57. N. Lunula Cl. — V. moderately asymmetrical, with convex dorsal and ventral margins 

 and subacute ends. L. 0,062; B. 0,oi6 mm. Median line straight. Axial area narrow, not dilated 

 around the central nodule. Strise 18 in 0, 01 mm., slightly radiate. coarsely punctate; puncta 13 

 in 0,01 mm. Median ventral striee not ending in isolated puncta. — Part I Pl. V f. 5. 



Marine: Java! 



Of this form 1 have seen one specimen only, in a gatheriug of shell-sand found at Java by 

 Dr. AuiiiviLLius. There were no freshwater forms in the material, so I have no doubt about the 

 marine habitat of this form, which could be placed in Cymbella, were not the puncta so distant 

 and the habitat marine. 



58. N. Grundleri Cl. a. G-run. (1878). — V. broad with almost parallel or very slightly 

 concave sides and broad rounded ends. L. 0,07.5 to O.ogs; B. 0, 028 mm. Median line excentric, 

 with large hook-shaped terminal tissures turned in the same directions. Axial area indistinct; 

 central area small and orbicular. Strise 10 to 12 in 0, 01 mm., slightly radiate in the middle and 

 convergent at the ends, coarsely punctate; puncta 9 to 12 arranged in undulating longitudinal 

 rows. — AUoioneis Grundleri Cl. West Ind. D. p. 7 Pl. II f. 10. 



Marine: West Indies! Campeachy Bay! Colon! Fossil: Oamaru, New Zeeland! 



Var. synimetrica Cl. — L. 0,07; B. 0, 03 mm. Median line almost central, its terminal 

 fissures small. Striaj 15, piincta 14 in 0,0 1 mm. 



Marine: Oamaru, New Zealand. fossil! 



This is a very remarkable species, not nearly akin to any other. The var. synimetrica, 

 although in some characteristics diifering from the type, can however in my opinion not be sepa- 

 rated from N. Grundleri, especially as the asymmetrical type occurs also at Oamaru. N. Grundleri 

 is a form intermediate to the Amphorw of the section Psanmiamphora or Amhlyamphora, and has 

 as these, the stria». in the middle between the central and terminal nodules divergent from the 

 median line. 



Additional. 



N. arverna Hérib. a. Perag. (1893). — V. broadlj' elliptical, with apiculate ends. L. 0,uä; 

 B. 0,0 13 mm. Axial area narrow. Central area star-like. Strise. 5 in 0, 01 mm. radiate in the 

 middle and alternately longer and shorter, transverse at the ends, coarsely punctate. — D. d'Au- 

 vergne p. 105 Pl. IV f. 19. 



Fresh water!* Aiivergne, fossil. 



