A. CLEVE-EÜLER, DIÄT. FLORA OF FINLAND. 59 



The outline of the valve being very different from that 

 of the other, broad-ended forms of Grammatophora, present 

 in the same samples, I have distinguished this form as a new 

 species, though it is imperfectly known. 



Striatella Ag. 



Striatella groenlandica östr. Kystd. Gronl. Tab. 2, f. 16. 

 Foss.: Kk, Knjäsha; a few specimens, probably belonging 

 to this species. 



Distr. (mar.): Greenland. 



Khabdonema Kütz. 



Rhabdonema arcuatum (Ag.) Kütz. var. maxima n. var. 

 — PI. 3, f. 66 a, b, c. 



Valve semilanceolate, with obtuse ends, boatshaped, 140 

 — 150 [1 in length. Cellulae of the annulus 5 in 10 [j.. Dia- 

 phragms of variable heigth. 



Foss.: Kk. Knjäsha, with the type in the arctic-marine 

 strata. 



This conspicuous form attains the size of Rhahdo7iema 

 Torellii Cl. D. Arctic Sea, p. 24, Tab. 4, f. 20, but must be 

 different from that species. 



In fossil deposits from the Litorina- e^och, Bhabdonema 

 arcuatum occurs copiously, but in much smaller specimens, 

 about 40 — 60 a in length. 



Rhabdonema Oestrupii n. sp. — PI. 3, f. 67 a, b. — Syn. 

 Rhabdonema minutum 0str. Mar. D. 0st-Gr0nl., p. 454, Tab. 

 6, f. 77. 



Valve 60 — 80 a in length, linear with inflated middle 

 and round, subcapitate ends. Breadth 12 — 16 [J.. Valve 

 striate; striae 7 in 10 a, punctate. Diaphragms as in Rhabdo- 

 nema minutum Kütz. 



Foss.: Kk. Knjäsha. 



Distr. {mar.) : East Greenland. 



This species was described and figured by östrup as a 

 big form of Rhabdonema ininutum. As, however, the outline 

 of the valve is rather different and intermediate forms do 

 not seem to occur, I think it deserves to be made a new 

 species. 



