68 ARKIV FÖR BOTANIK. BAND 14. N:0 9. 



Terpsinoe Ehb. 



Terpsinoé trifoliata Cl. — Perag. D. Mar. de France. Tab. 

 90 f. 7, 8. — Syn. Triceratium trijolmm A. S. Atl. Tab. 78 f. 4. 

 Foss.: Ok. Paltamo, rare. 

 Distr. {mar.): (foss.) Auvergne; Barbados. 



Entogoiiia Grev. 



Entogonia sp.? — P]. 3, f. 73. 



Foss.: Kk. Knjäsha, Koudajärvenpää. Several fragments 

 of very coarse structure were met with in the marine strata 

 from the quoted localities. The silicious plate is perforated 

 by pores, 9 [i in diameter. As I have no knowledge of the 

 outline of this fossil valve, I cannot say anything about its 

 nature. The large pores mind of the genus Entogonia, for 

 instance E. Jeremiae Bergon from Haiti, delineated in Le 

 Diatomiste I, Tab. 20, f. 11. Also a large Hemiaulus or 

 Biddulphia might be suggested. 



Thalassiosira Cl. 



Thalassiosira decipiens (Grun.) Gran. — Nord. Plankton, 

 p. 17, f. 10. — Syn. Coscinodiscus decipiens Grun. V. H. Syn. 

 Tab. 91, f. 10. Thalassiosira gelatinosa Hensen. 



Foss.: Kk. Knjäsha, rather frequent. 



Distr. {mar.): N. E. Greenland (0strup), coasts of N. 

 Europe. 



Thalassiosira gravida Cl. D. Baff. Bay, p. 12, Tab. 2, 

 f. 14 — 16. — Nord. Plankt., p. 18, f. 12. — Syn. Coscinodiscus 

 suhglohosus Cl. & Grun. 



Foss.: Ka. Viborg-deposit (Cleve); Kk. Knjäsha, fre- 

 quent. 



Distr. {mar.): Arctic Sea, coasts of North Europe, East 

 America. 



Coscinodiscus Ehb. 

 Coscinodiscus anguste-lineatus A. S. — Nord. Plankton, 

 p. 30, f. 30 b. 



Foss.: Kk. Knjäsha. 



Distr. {mar.): Arctic Sea, Atlantic. 



According to Gran, Nord. Plankt. 1. c, the nature of 



