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



39. N. punctulata 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. 

 Striae 10 to 13 in 0,oi mm., radiate throughout. Puncta 10 in 0,oi mm. equidistant. Among the 

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

 N. marina Ralfs Pritch. Inf. p. 903 (1861). Uonk. B. D. p. 19 PI. Ill f. 5. A. S. Atl. VI f. 9. 

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



Marine and brackish: Greenland! Finmark! Sea of Kara! North Sea! Caspian Sea (Grrun.), 

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

 fornia! 



Var. cluthensis Gtreg. (1857). — V. elliptical, with rounded ends. L. 0,o45 to0,05; B. 0,o25 

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

 14 in 0,01 mm., radiate throughout, punctate; puncta 12 to 13 in 0,oi mm. — N. cluthensis Gtieg. 

 D. of Clyde p. 478 PI. IX f. 2. N. CI v. maculifera Cl. N. R. D. p. 9 PI. II f. 23. K erythrcea 

 Gkun. Verh. 1860 p. 539 PI. V f. 17. 



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

 Nicobar Island! Tahiti! 



Var. finmarchica Grun. (1880). — L. 0,o36 to 0,o47; B. 0,022 to O.024 mm. Striae 11 to 12 

 in 0,01 mm. Central area indistinct. — N. cluth. v. finm. Grun. A. D. p. 40 PL II f. 49. 

 Marine: Finmark (Grun.). 



Var. striolata Grun. (1884). — Striae 14 in 0,oi mm. Puncta 8 in 0,oi mm. forming longi- 

 tudinal rows. — N. cluth. v. striol. Grdn. Franz Jos. Land D. 1884 p. 104. Cl. M. D. N:o 156. 



Brackish water: Fiskebackskil, Sweden. 



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

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

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



Marine: N. Zealand (Grun.). 



Y&r. pagophila Grun. (1884). — L. 0,o.3i; B. 0,oi4 mm. Areas indistinct. Striae 14in0,oi 

 mm., distinctly punctate. — N. cluth. v. pagophila Grun. Franz Jos. Land D. p. 104 PL I f. 30. 



Marine: Franz Jos. Land. 



The name N. punctulata was given 1842 by Ehrenberg to a form, which, to judge from 

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

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

 lata and N. Cluthensis 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 striae a few shorter are usually intermixed, which with 

 other characteristics shews that N. punctulata is nearly akin to N. humerosa. By the var. clu- 

 thensis it is also related to N. glacialis Cl. As N. cluth. var. minuta I, in 1881 (N. E,. D. p. 10 

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

 section Punctatce, 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,o27 to 0,055 mm. Terminal fissures in the same direction. 

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

 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.). 



