KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 27. N:0 3. 19 



14. N. Aiithracis Brun a. Cl. (1889). — V. lanceolate, acute. L. 0,or, to 0,06; B. (),oi4 to 

 0,018 mm. Axial area unilateral. Central area also unilateral, but on oppo.site side to the axial 

 area and connected with a narrow longitudinal area. Strim 7 (middle) to 8 (ends) in 0,01 mm. I'a- 

 diate in the middle, transverse at the ends, coar.sely lineate; linoolte 20 in 0,oi mm. — U. f. du 

 Japon p. 41 PI. V f. fi. N. Flattii Pant. Ill PI. XXII f. 330 (1893). 



Fresh water (marine?): Japan, fossil! 



15. N. maculosa Donk. (1871). — V. broadly linear, with apiculate ends. L. 0,04 5 to0,o68; 

 B. 0,0 13 mm. Axial area narrow; central area orbicular. Strite 10 in 0,oi mm. radiate in the 

 middle, transverse at the ends, finely lineate, crossed by two undulating, narrow, lateral areas. 

 — B. D. p. 25 PI. V f. 1. N. albinensis Grun. Franz Jos. Land D. p. 103 PI. I f. 29 (1884). 



Marine: Scotland! 



Original specimens of Donkins N. maculosa in Deby's Collection agree perfectly with origi- 

 nal specimens of Grunows A\ albinensis. 



16. N. tuseula Ehb. (1840). — V. elliptical, with protracted, capitate ends. L. 0,05; B. 0,oi5 

 mm. Axial area narrow; central area large, transverse, subrectangular. Striee 12 to 14 in 0,oi mm. 

 radiate in the middle, transverse at the ends, very finely lineate and crossed by several irregu- 

 larly undulating longitudinal bands. — Pinnularia tuseula Ehb. Ber. 1840. Staiiroptera tuseula 

 Ehb. M. G. VI: 1 f. 13 a. Stauroneis punctata KtJTZ. Bac. p. 106 PL XXI f. 9 (1844). W. Sm. 

 B. D. I PL XIX f. 189. DoNK. B. D. p. 36 PL V f . 12. Navicula tuseula V. H. Syn. p. 95 PL X 

 f. 14. Stauroneis meniseus Schum. Preuss. D. p. 189 PL IX f. 54 (1862)? Navie. tumida var. subsasla 

 Strose Klieken PL I f. 10? 



Fresh or .slightly brackish water (larger lakes): Spitsbergen (Lagst.), Beeren Eiland (Lagst.), 

 Iceland! Sweden (Malaren, Wenern, Ringsjon)! Finland! Gulf of Bothnia (Tornea, Pitea)! England! 

 Belgium (V. H.), Switzerland (Brun), Illinois! Fossil at Konigsberg! Klieken! Kostock! S:ta Flora! 



According to Grunow (F. D. Ost. Ung. p. 145) the cell-contents of Nav. tuseula are very 

 different from those of other species of Naviculse. 



17. N. Salinanim Grun. (1880). — V. elliptic-lanceolate, with protracted, capitate ends. 

 L. 0,023 to 0,037; B. 0,01 to 0,012 mm. Axial area indistinct; central area distinct, orbicular. 

 Strise 14 to 16 in 0,oi mm., distinctly lineate, in the middle strongly radiate and alternately 

 longer and shorter, in the ends transverse. — A. D. p. 33 PL II f. 34. V. H. Syn. p. 82 PL VIII 

 f. 9. N. Carassius Grun. Verb. 1860 p. 537 PL III f. 31; PL IV f. 11. 



Brackish water: Spitsbergen! Sea of Kara! Finmarken! Sweden (Malmo)! Holstein! Belgium 

 (V. H.), England! Saxony! Neusiedlersee, Hungary (Grun.). 



Var. intermedia Grun. (1880). — V. lanceolate, with subcapitate ends. L. 0,035 to 0,o4; 

 B. 0,0 7 mm. Strise 14 (middle) to 18 (ends), in the middle alternately longer and shorter, strongly 

 radiate, in the ends convergent. — N. crypt ocepliala v. int. Grun. in V. H. Syn. PL VIII f. 10. 



Fresh water: Sweden, Ringsjon in Skane! New Zealand! 



By the var. intermedia is N. Salinarum connected with forms of N. cryptocephala as well as 

 with N. notabilis Pant. 



18. N. Rho Cl. N. Sp. — V. lanceolate, rostrate, obtuse. L. 0,115; B. O.026 mm. Axial 

 area very narrow, in the middle dilated into a large orbicular central area. Strise 11 inO,oi mm., 

 distinctly lineate (lineolse 25 in 0,oi mm.), in the middle strongly radiate and alternately longer 

 and shorter, in the ends transverse. — Part. I PL III f. 35. 



Mouth of rivers: China, Canton River! 



This species resembles N. elcgans, but differs by the distinctly lineate strise. 



19. N. notabilis Pant. (1889). — V. lanceolate, acute. L. 0,04 to 0,o56; B. 0,oo9 to 0,012 

 mm. Axial area indistinct; central area small, somewhat transverse. Strise 10 to 11 (12,5 Pant.) 



