KONGL. SV. VET. AKADEMIENS IIANDLINGAR. BAND 27. N:f) 3. 47 



39. N. puiictiilata W. Sm. (1853). — V. elliptic-lanceolate, with subrostrate ends. L. 0,o4 

 to 0,06; B. OjO'i.'i 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 PI. XVI f. 151. 

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

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



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

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

 fornia! 



Var. cluthensis Greg. (1857). — V. elliptical, with rounded ends. L. 0,o45 to0,05; B. 0,025 

 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. clnthensis Gnmi. 

 D. of Clyde p. 478 PI. IX f. 2. K CI. r. macidifera Cl. N. R. D. p. 9 PL II f. 23. N. erythra-a 

 Grun. Verb. 1860 p. 539 PI. V f . 17. 



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

 Nicobar Island! Tahiti! 



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

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



IVIarine: Finmark (Gnin.). 



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

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



Brackish water: Fiskebackskil, Sweden. 



Var. Norce ZeaJandice Grun. (1884). — L. 0,029; B. OjOi.-i 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.). 



Ya,v. pagophila Grun. (1884). — L. 0,0.3 1; 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. punctti- 

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

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

 I have united them. Among the median striae a few shorter are i;sually intermixed, which with 

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

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

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

 section Pmictatce, 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. 0,0.^)4 to 0,10; B. 0,027 to 0,o55 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. — Verb. 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! Labimn! 

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



