f 



BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 24. AFD. III. N:0 2. 7 



V. curta Grun. — L. 0,o6; B. 0,022 mm. Str. 6 in 0,oi mm. 

 Axial area narrow. — Rare. 



P. spitshergensis Cl. — Cape Flora. Common in some 

 samples. 



P. stauroptera Grun. — Rare, Cape Flora, Fastern Glacier. 

 — L. 0,065; B. 0,01 mm. Str. 12 in 0,oi mm., interrupted 

 hy a broad fascia. 



P. mesogongyla var. interrupta Cl. — Common in some 

 samples. 



P. hyperborea Cl. N. sp. — Narrow. gradually 

 tapering towards the obtuse ends. L. 0,03; B. 0,oo5 mm. 

 Str. 15 in 0,oi mm., radiate in the middle, convergent 

 at the ends. Axial area lanceolate, reaching in the 

 middle to the margin of the valve. — Rare, Cape 

 Flora. 



P. viridis var. fallax Cl. — L. 0,055; B. 0,oi mm. 

 Str. 12 in 0,oi mm. A. S. Atl. XLV 10, 11. — Fig. 3. 

 Common. i'^*^»*-^'- 



This form might be united to P. isostaiiron, which difFers 

 only by the transverse fascia, and considered as a separate 

 species, characterized by its parall el strire and narrow axial area. 



P. viridis var. rupestris Hantzsch. — In a sample from 

 •Cape Flora was met with some few specimens of a very small 

 variety. L. 0,02; B. 0,oi3 mm. and 17 striee in 0,oi mm. 



P. streptoraphe v. styliformis Grun. — Rare, Cape Flora. 



P. isostauron Grun. — Common. — See P. viridis var. 

 fallax. 



P. arctica Cl. N. sp. — Narrow elliptical, with 

 obtuse ends. L. 0,023; B. 0,oo6 mm. Strise 13 in 

 0,0 1 mm., parallel. Axial area narrow, becoming wider 

 towards the middle of the valve, where it expands 

 into a transverse fascia. — Cape Flora, rare. 



Amphora Normani Rabh. — Rare, Cape Flora. 



A. ovalis v. pedicidus Kutz. — Rare in some ^^s- *• 



-, 1000 t. m. 



samples. 



Elioicosphenia curvafa Kutz. — Some few specimens were 

 found in a sample from Bell Isle, probably derived from the sea. 



Achnanthes marginidata Grun. — Rare at Cape Flora. 



A. mimitissima Kutz. — Not rare. 



A. lincaris var. pusilla Grun. — L. 0,015; B. 0,00:3 mm. 

 Str. 24 in 0,oi mm. — Not rare in many samples. 



