KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 75 



II. Capitatse. 



Artificial Jcey. 



J Valve rostrate P. inicrostauron Ehb. 



I — capitate 2. 



Valve with undulated margins P. niesolepta Ehb. 



— not undulated 3. 



Valve linear P. interrupta W. Sm. 



— lanceolate 4. 



Capitate ends broad aud large P. globiceps Greg. 



— ends small 5. 



Valve lanceolate P. Braunii Grun. 



— almost linear 6. 



, j StrisB 16 to 18 in 0,0l mm P. appendiculata Ag. 



■ I — 12 to 13 in 0,01 mm P. suhcapitata Gkeg. 



6. P. appendicniata Aa. (1828). — V. linear, gently tapering from the middle to the 

 slightly rostrate-capitate ends. L. 0,oi8 to 0,o.36; B. 0,oo4 to 0, 00.5 mm. Area very narrow, dila- 

 ted in the middle to a transverse fascia. Strite 16 to 18 in 0,yi mm., slightly radiate in the middle, 

 convergent at the ends. — Frusfulia upp. Ag. Icon. Alg. Eur. Pl. I (according to Klltz). Nav. 

 app. KtJTZ Bac. p. 93 Pl. III f. 28. V. H. Syn. p. 79 Pl. VI f. 18, 20. N. upp. v. irrorata Grun. 

 V. H. Syn. Pl. VI f. 30, 31. Nav. Naveana Grun. Verh. 1863 p. U9 Pl. IV f. 24. V. H. Syn. 

 Pl. VI f. 29. 



Fresh water (moist rocks, mosses etc): Iceland! Scotland! Sweden (Gothland)! Belgium 

 (V. H.), Briinn (Grun.), Bengal! Australia (Blue Mountains)! Greenland! JSTew Jersey (Hoboken)! 

 Ecuador ! 



Var. hudensiti Grun. (188U). — V. gibbous in the middle, with distinctly capitate ends. 

 Striee 20 to 23 in 0,oi mm. — V. H. Syn. Pl. VI f. 27, 28. 



Hot springs: Buda-Pesth (Grun.), New Zealand! 



P. appendiciilata is closely connected with P. snhcapitata and P. molaris and the other hand 

 through the var. hudensis with P. Braunii. 



7. P. Braunii Grun. (1876). — V. lanceolate, with capitate or subcapitate ends. L. 0,035 

 to 0,0.5; B. 0,009 to 0,008 mm. Axial area narrow, gradually increasing in breadth towards the 

 middle of the valve, where it expands to a large and broad, transverse fascia. Strife. Il to 12 in 

 0,01 mm., divergent in the middle, convergent at the ends. — Nav. Brauniana Grun. in A. S. Atl. 

 XLV f. 77, 78. Nav. Braunii Grun. in V. H. Syn. p. 79 Pl. VI f. 21. 



Fresh water: Iceland! Sweden (Rosslängen in Kalmar län! Loka, Atl.), Finland! Belgium 

 (V. H.), Bengal! Australia (Blue Mountains)! Argentina! Brazil! 



8. P. subcapitata Greg. (1856). — V. linear, with subcapitate to capitate ends. L. 0,03 to 

 0,05; B. 0,005 to 0,006 mm. Axial area narrow or indistinct. Central area a transverse fascia. 

 Strige 12 to 13, slightly divergent in the middle, convergent at the ends. — M. J. IV p. 9 Pl. I 

 f. 30. Pin. Hilseana Janisch in Rabh. Alg. Sachs. N:o 953 (1860). Nav. Hilseana A. S. Atl. XLV 

 f. 65. V. H. Syn. p. 77 Suppl. A. f. 11. Nav. stibcapitata A. S. Atl. XLIV f. 53, 55. V. H. Syn. 

 p. 78 Pl. VI f. 22. A. S. Atl. XLV f. 59, 60. 



Fresh water: Spitsbergen! Sweden (Helsingland, Upsala, Marstrand, Gothland)! Finland! 

 Scotland! England! Kiel! Belgium (V. H.), Bengal! Amsterdam Island! Australia (Blite Mountains)! 

 Argentina! Ecuador! Greenland! 



Var. paucisfriata Grun. — Striee short, gradually shortened towards the middle, where is 

 a very broad transverse fascia. — V. H. Syn. p. 79 Pl. VI f. 23. 



