304 Part III. — Fifteenth Annual Report 



Fig. 7. Choetoceros peruvianus, Btw., 500 t.m.; b, piece of the awn, 

 1000 t.m. 



Fig. 8. (Choetoceros current, CI.; a and b, specimens from Spitsbergen ; 

 c, valve ; all 500 t.m. ; d, piece of the awn, 1000 t.m. 



Fig. 9. Nitzschia migrans, CI., n. sp., 1000 t.m. 



Fig. 10. Nitzschia lineola, CI., n. sp., 500 t.m. ; b, piece of the valve, 

 1000 t.m. 



Fig. 11. Nitzschia (seriata var. ?) fraudulenta, CI., n. sp., 500 t.m.; 

 b, piece of the valve, 1000 t.m. 



Fig. 1 2. Rhizosolenia setigera, Btw. ; first b second, and c third, state 

 in the formation of interior cells (Pyxilla baltica, Grun.) ; 

 all from Sweden (March 1896) ; 200 t.m. 



Fig. 13. Rhizosolenia semispina, Hensen, 500 t.m. (Sweden). 



Fig. 14. Dactyliosolen mediterraneus var. tenuis, CI. ; b, ignited; both 

 . 500 t.m. 



Fig. 15. Corethron hystrix, Hensen; entire frustule in zonal view; 



b, in valvular view, from the North Sea (Oct. 1896); c, 

 ignited specimen from Shetland Islands ; all 500 t.m. 



Fig. 16. Bacteriastrum delicatulum, CI., n. sp. ; b ignited specimen; 



c, valve ; all 500 t.m. 



