16 P. T. CLEVE, ON DIATOMS FROM THE ARCTIC SEA. 



62. Navicula pygmaa Kg (Sp Alg pag. 77. Navicida 

 minutida Sm. Syn II, pag. 91. Syn I, pao-. 48, Pl. XXXI 

 fig. 274. Bonk. Br. D. pag. 10, Pl. I, fig.^^lO).' Finmarken 

 Grötsund. 



63. Navicula Lyra Ehb (Gkeg. Diat. of Clyde pag. 485, 

 Pl. IX, fig. 13 b. Bonk. Br. D. pag. 14, Pl. II, fig. 7). Fm- 

 marken Grötsund. Spetsbergen Sclioal Point. Greenland some- 

 what rare. This very variable species occurs abundantly in 

 most seas. 



64. Navicula (Amphiprora?) arctica Cl X. Sp. S. V. ellip- 

 tical lanceolate, gradually attenuated from the middle to tlie 

 somewhat obtuse apices. Stria^ fine, about 34 in 0,0 2 5, almost 

 parallel, interrupted by a line, passing in the middle of eacli 

 of the halves of the valve. Central nodule transversely dila- 

 ted as in a Stauroneis and the ends of the staxiros j oined to 

 the two lines. 



Length 0,ii9 m.m. Bredth 0,034 m.m. 

 Finmarken Grötsund very rare, only one specimen being 

 observed. 



This navicula or stauroneis resembles somewhat the doubt- 

 ful »Amphora Stauroptera» Bail Sm. Contr. vol. A^II, 1855, 

 notes on new Sp. pag. 8, fig. 14 & 15. 



Pl. III, fig. 13. 



?65. Navicula abrupta Greg. (Diat. of Clyde pag. 14, Pl. 

 I, tig. 14. Bonk. Br. D. pag. 13, Pl. II, fig. 6). Spetsbergen 

 Kings Bay. 



6Q. Navicula Hennedyi Sm. (Syn. II, pag. 93. Bonk. Br. 

 D. pag. 11, Pl. II, fig. 3). Finmarken. Spetsbergen: Hackluyts, 

 Schoal Point, Hinlopen Strait, Kings Bay. 



N. Hennedyi is one of the most common diatoms and 

 occurs in almost all seas. 



67. Navicula Pinnularia Cl. (Öfvers. af K. Vet. Akad. 

 Förh. 1868, pag. 224, Pl. IV, fig. 122). Finmarken Grötsund. 

 Spetsbergen Hackluyts. Greenland. Found before on the western 

 coast of Sweden. 



68. Navicula directa (Sm) {Pinnularia directa Sm. Syn. I, 

 pag. 56, Pl. XVIII, fig. 172) very common. Finmarken. Spets- 



