BIIIANG TILL K. SV. VET.-AKAl). JIANDL. BAND 1. N:0 13. 15 



as ou Navicula pra^texta). Lengtli 0,07 0— 0,i i m.in. Breadth 

 0,05 1—0,066 m.m. StriK 23 — 27 in 0,025 m.m. 



Spetsbergen l>randwyns Bay. Greerdand. Pl. III, fig. 12. 



54. Cocconeis costata Grkg (T. ]\I. S. \, pag. 68, Pl. 1, 

 fio-. 7. Snrirella (jnarnerensls Grun A^crk. 18(52, pag. 456, T. 

 IX, fi<T. 10?). T o\cxvi\Åy common Sjtetsbergen, Greerdand, Davis 

 Strait, Fhmiarhen. 



55. Navicula Smithii Bkéh (.V. elliptira Sm. Svb. I, pag. 

 48, Pl. XVII, fig. 152. Nav. didijma Sm. 1. c, fig. 154 a). 

 Verv common. Sioetshergen: ex. gr. Amsterdam Id. 20 fath. 

 Brandwyns Bay 10 — 15 fath., Kings Bay 150 fath. Finmarken 

 Grötsvmd. Greenland. Common in all seas. 



56. Navicula fusca Greg {N. Smithii var. fnsca Greg 

 Diat. of Clyde pag. 486, Pl. IX, fig. 15. A^. hyperhorea Geun. 

 Verh. 1862, pag. 531, Pl. I, fig. 16). Finmarken. Somewhat 

 rare. Found before in Scotland and on the coasts of Swedeu. 



57. Navicula suborbicularis Greg (Diat. of Clyde pag. 541, 

 Pl. IX, fio-. 17). Davis Strait in mud from great depthsi 

 This species is also widely distributed in almost all seas. 



58. Navicula astiva Donk. (T. M. S. N. S. VI, pag. 32, 

 Pl. III, fig. 18. Donh Br. Diat. pag. 6, Pl. I, fig. 3). Fin- 

 marken Grötsund somewhat rare. Length 0,12 m.m. Breadth 

 0,06 5 m.m. Stria^ 15 — 16 in 0,02 5 m.m. 



59. Navicula didyma (Ehb) Donk. Br. Diat. Pl. VII, fig. 

 8 a. h). Spetsbergen ex. gr. Hacklnyts, Schoal Point, Hinlopen 

 Strait. Kings Bay (160 fths) Finmarken. iJavis Strait. Com- 

 mon in all seas. 



60. Navicula splendida Greg (T. M. S. IV, pag. 44, fig. 

 14. Nav. Bombus CL p. p. Öfvers. K. Vet. Akad. Förh. 

 1867, pag. 665. Nav. Entomon Donk Br. Diat. Pl. VII, fig. 

 5?). This form, closely related to X". didyma, if not its variety, 

 occurs very commonly in the arctic sea. Spetsbergen: Amster- 

 dam Id. (20 fths), Brandwyns Bay (10—15 fths), Schoal Point. 

 Beeren Eiland, Finmarken, Greenland. 



61. Navicula Bombus Ehb (Greg Diat. of Clyde pag. 484, 

 Pl. IX, fig. 12. Donk. Br. D. Pl. VII, fig. 7 a). Finmarken 

 Grötsund somewhat rare. 



