KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 47 



39. N. piiuctulata W. Sm. (1853). — V. elliptic-lanceolate, with subrostrate ends. L. 0,04 

 to 0,06; B. 0,025 to 0,03 mm. Axial area narrow or indistinct. Central area small, orbicular. 

 Strife 10 to 13 in 0,oi mm., radiate thronghout. Puncta 10 in 0,oi mm. eqnidistant. Among the 

 median striffi there are a few shorter frequently intermixed. — B. D. I p. 52 Pl. XVI f. 151. 

 N. marina Ralfs Pritch. Inf. p. 903 (1861). Donk. B. D. p. 19 Pl. III f. 5. A. S. Atl. VI f. 9. 

 V. H. Syn. p. 98 Pl. XI f. 16. 



Marine and brackish: Greenland! Finmark! Sea of Kära! North Sea! Caspian Sea (Grun.), 

 Massachusetts! Florida! Barbados! South Africa! Mediterranean Sea! Ceylon! Port Jackson! Cali- 

 fornia ! 



Var. duthensis Greg. (1857). — V. elliptical, with rounded ends. L. 0,o45 to0,05; B. 0,o2ä 

 mm. Axial area indistinct or narrow. Central area indistinct or small, orbicular. Strise 10 to 

 14 in 0,01 mm., radiate throughout, punctate; puncta 12 to 13 in 0,oi mm. • — N. duthensis GtREa. 

 D. of Clyde p. 478 Pl. IX f. 2. N. Cl. v. mamlifera Cl. N. R. D. p. 9 Pl. II f. 23. N. erythraa 

 Grun. Verh. 1860 p. 539 Pl. V f. 17. 



Marine and brackish: Finmark! North Sea! Baltic! Cape Horn (Petit), Madagascar! Ceylon! 

 Nicobar Island! Tahiti! 



Var. fmmarcMca Grun. (1880). — L. 0,o36 to 0,047; B. 0,022 to O.024 mm. Striaä 11 to 12 

 in 0,01 mm. Central area indistinct. — N. dtdh. r. finm. Grun. A. D. p. 40 Pl. II f. 49. 



Marine: Finmark (Grun.). 



Var. striolafa Grun. (1884). — Strise 14 in 0, 01 mm. Puncta 8 in 0,oi mm. forming longi- 

 tudinal rows. — N. dufh. r. striol. Grun. Franz Jos. Land 13. 1884 p. 104. Cl. M. D. N:o 156. 



Brackish water: Fiskebäckskil, Sweden. 



Var. Norce Zealandice Grun. (1884). — L. 0,029; B. 0,oi5 mm. Striie 11 (middle) to 14 

 (ends) in 0,oi mm. Central area indistinct. Valve with a marginal furrow. — N. dtith. v. Nova 

 Zeal. Grun. Franz Jos. Land D. p. 104. 



Marine: N. Zealand (Grun.). 



Var. jiac/ophila Grun. (1884). — L. 0,o3i; B. 0,oi4 mm. Areas indistinct. Strise 14inO,oi 

 mm., distinctly punctate. — JV. dufh. v. pagophila Grun. Franz Jos. Land D. p. 104 Pl. I f. 30. 



Marine: Franz Jos. Land. 



Tlie name i\^. pundulata was given 1842 by Ehrenberg to a form, which, to judge from 

 the figure in the Micro-geologic is doiibtless Anomoeoneis serians. As this species is not included 

 in Navicula, I think it advisable to retain the name, given by W. Smith. Betweeu N. pnnctu- 

 lata and N. Clufhensis there are no distinctions other than the form of the ends, which are sub- 

 rostrate in the former and broadly rounded in the latter. This characteristic is so trifling that 

 I have united them. Among the median strife a few shorter are usually intermixed, which with 

 other characteristics shews that -A^. piundulata is nearly akin to N. humerosa. By the var. du- 

 thensis it is also related to N. gladalis Cl. As iV. clutli. rar. minuta I, in 1881 (N. R. D. p. 10 

 Pl. II f. 22), described a small form with more distinct axial area. It does not belong to the 

 section Pzindofte, and, as it is not sufficiently characterized, may be dropped. 



40. N. brasiliensis Grun. (1863). — V. lanceolate or elliptic-lanceolate, sometimes with 

 subrostrate ends. L. 0,054 to 0,i6; B. 0,027 to 0,o55 mm. Terminal fissures in the same directiön. 

 Axial area indistinct. Central area small, rounded, frequently slightly transversely dilated. Strise 

 8 to 12 in 0,01 mm. slightly radiate throughout. Puncta close towards the margins, more distant 

 in the- median part of the valve, where they form longitudinal, undulating rows. — Verh. 1863 

 p. 152 Pl. V f. 10. Novara p. 19. A. S. Atl. Pl. VI f. 19 to 25, 31 to 33. 



Marine: Atlantic coast of N. America (Connecticut, North Carolina)! West Indies! Cam- 

 peachy Bay! Brazil! Bab el Mandeb! Zanzibar (Atl.), Madagascar! Ceylon! Singapore! Labuan! 

 China! Japan! New Caledonia! Samoa! Sandwich Islands (Atl.). 



