normts 



KONGL. SV. VET. AKADKMIKNS IIANDLINGAR. HANI) 26. N:() 2. 61 



45. C. abnorniis r4Ri'N. (1S7S). — V. lanceolate, with broad, obtnsf pikIs. L. 0,o28 to 0,or)5 ; 

 B. 0,007 to 0,00'.) mm. Axial area very narrow; central area small, orbicular. Median lines straight, 

 with approximate central pores, and terminal fissures turned in contrary direction. StrifB 30 

 (Grunow) to 34 in 0,oi mm. transverse. Ijongitudinal lines faint, submarginal. — Nav. ah 

 G^RUN. in CI. M. D. N:o 142. A. 1). p. 46. CuL abn. Icon. n. Part. IV PI. I f. 6, 7. 



Marine: Bohuslan, Sweden! 



46. €. brevis Grey. (1H57). — V. elliptical, with rostrate, obtu.se ends. L. 0,of, tf) 0,08; 

 B. 0,022 to 0,0:5 mm. Median line with distant central pores. Axial area jiarrow, dilated in the 

 middle to a large, orbicular space. Stripe 14 in 0,oi mm., almost j)arallel, not distinctly punctate. 

 Longitudinal lines indistinct. — Nav. hrecis Greg. D. of Clyde p. 478 PI. IX f. 4. A. S. N. S. D. 

 PI II f. 15. DoNK. B. I), p. 19 PI. Ill f. 4. V. H. Syn. p. 97 PI. XI f. 19. — Nav. crassa Greg. 

 M. J. Ill p. 41 PI. IV f. 18 (1855)? 



Marine: Spitsbergen! Greenland! Finmark! North Sea! North Siberian Sea, Cape Desch- 

 nitf! Lofanger, Angermanland, Sweden, (integlacial deposit)! Sydney (Thum.)! 



Var. vexans Grun. (1880). — Elliptic-lanceolate, with broad, obtuse ends. — Nav. hrcvis v. 

 vexaus Grun. A. D. p. 30. A. S. N. S. D. PI. II f. 14. Nav. brev. v. cUiptica V. H. Syn. p. 97, 

 PI. XI f. 18. 



Marine and brackish: Sea of Kai'a! Finmark! Japan (strict! 18 in 0,oi mm. Weissflog. Coll.)! 



Var. distoma Grun. (1880). — V. elliptical, with broad ends. Central pores of the median 

 line distant. Central nodule large, thick. Longitudinal lines distinct, single or double. 



Forma Jatior: Broadly elliptical. L. 0,078; B. 0,026 mm. Striaj 13 to 14 in 0,oi mm. — 

 Nav. (brevis var.?) diatoma f. lat. Grun. A. D. p. 31 PL I f. 25. 



Brackish water: Sea of Kara (Grun.), Japan! 



Forma angiistior: Narrow elliptical. L. 0,06 8; B. 0,oi'j mm. Stripe 15 to 16 in 0,oi mm. 

 — Nav. (brevis var.?) diatoma f. ang. Grun. A. I), p. 31 PL I f. 26. 



Brackish water: Jamal, Sea of Kara (Grun.). 



Forma bicuneata Cl. — V. with parallel margins and cuneate ends. L. 0,o85; B. 0,02<j mm. 

 Stripe 14 to 15 in 0,oi mm 



Marine: Japan, fossil (Brun Coll.)! Sydney! China! 



Nav. brevis and its varieties are nearly akin to N. amphishcena. 



47. C. bottnica Cl. N. Sp. — V. elliptic-lanceolate. L. 0,o.'j; B. 0,018 ram. Central pores 

 distant. Axial area broad, gradually dilated towards the middle, where it expands to a transverse 

 fascia. Stripe 22 in 0,oi mm. slightly radiate towards the ends. Longitudinal line faint, margi- 

 nal. — PL III f. 42. 



Slightly brackish water: Gulf of Bothnia at Pitea! 



48. C. Lagerheimii Cl. N. Sp. — V. elliptic-lanceolate convex, with obtu.se ends. L. 0,042; 

 B. 0,009 mm. Axial and central areas uniting in a lanceolate-linear space. Stria'. 17 in 0,oi 

 mm. very slightly radiate towards the ends. Longitudinal lines indistinct marginal, or inframarginal. 



Fresh water: Ecuador, Quito (Lagerheim)! 



49. €. latinsciila Ktixz (1844). — V. elliptical to lanceolate. L. 0,07.5 to 0,09; B. 0,023 to 

 0,0.3 mm. Axial and central areas uniting in an irregularly lanceolate space. Stripe 18 to 21 

 in 0,01 mm. parallel, finely punctate. Longitudinal lines marginal or inframarginal. — Nav. 

 latiuscula Kutz Bac. p. 93 PL V f. 40. Grun. Verb. 1860 p. 534 PL IV f. 38. Donk. B. 

 D. p. 27 PL IV f. 7. Nav. pafiila W. Sm. B. D. I p. 49 PL XVI f. 139 (1853). V. 11. Syn. 

 Suppl. B f. 29. 



Fresh water, larger lakes: Scotland; Sweden: Venern! Malaren! Baltic, freshwater deposits 

 of the Ancylus-epoch! Gotland! Switzerland (Lac des 4 cantons, Lac Leman)! 



