KONGL. SV. VET. AKADKMIENS I1ANDLIN(JAK. BAND 26. N:() 2. 128 



Var. a)»phipJf'itroi(hs fxRUN. (1S80). - L. 0,1:5; B. 0,02 mm. Central iiodnlc elongated; median 

 line slightly exoentric. Transverse strite 23, longitudinal striae 18 to 1!) in 0,01 mm. — Van- 

 heurckia rhomb, var. amphiid. Grun. A. D. p. 47 PI. Ill f. 59. 



Fresh water: Finland (Russian Lapland, Ladoga)! Mouth of Jenissey! Vancouver Island 

 (Grove Coll.)! 



Var. saxonica Rabh. (1851). — V. lanceolate, with rostrate ends. L. (J,(i.^) to 0,07; B. 0,013 

 to 0,02 mm. Strife fine, 34 to 35 (V. H. Syn.). — Frusfidia .saxonica Rabii. (Bac. exc. N:o 42. 

 Fl. E. Alg. p. 227). Grun. Banka D. PI. I f. 13. Nar. crassitwrria Br6b. in W. Sm. B. D. p. 47 

 PL XXXT f. 271 (1853). Grun. Verh. 1860 p. 548 PI. V f. 12. Donk. B. D. p. 42 PI. VI f. 12. 

 VanJuurckia cra.s-.'j. Br6b. Ann. Soc. phyto. et microgr. de Belgique Vol. I p. 204 (18(i8). 



Fresh water: Spitsbergen (Lagerst.), Beeren Eiland (Lagerst.), Sweden! Finland! Germany! 

 Australia (Blue Mountains, Daintree River)! New Zealand! Bengal! 



Var. virulula Br^b. (1849). — Frustnles in gelatinous tubes. V. elongated, with broad, obtuse 

 ends. L. 0,o8 to 0, 11; B. 0,i)i.'j mm. Strite 28 to 30 in 0,oi mm. (V. H.). — Colleton, virididum 

 Br^b. in Klltz. Sp. A. p. 105. Vanheurckia virid. Br^b. Ann. Soc. phyt. et micr. de Belgique 

 Vol. I p. 203 (1868). V. H. Syn. p. 112 PI. XVII f. 3. Frustnlia forphacea A. Br. in Rabh. Alg. 

 Sachs. X':o 761 (1858). 



Fresh water: Germany! France (Breb.). 



4. F. interposita Lewis (1865). — V. linear-elliptical, with broad, rounded ends. L. 0,i2 

 to 0.1:5; B. 0,u2.T to 0,02 7 mm. Central nodule small, terminal nodules small, approximate to the 

 ends. Transverse strife 20, longitudinal 18 in 0,oi mm. ■ — Nav. mfer^^o.svYa Lewis Proc. Ac. Philad. 

 1865 PI. II f. 19. Nav. Martonfii Pant. Ill PI. XVII f. 247 (1893)? 



Brackish water: Sierra Leone! Bombay (Gfove Coll.)! Savannah Ga.! Oakland, Calif.! South 

 America (Lewis), Hungary, Tallya fossil (Grun.). 



Var. luhuensis Cl. (1883). — Narrow elliptic-lanceolate witli obtuse ends. L. 0,06?, to 0,072; 

 B. 0,0 15 mm. Transverse striae 17; longitudinal 18 to 21 in 0,oi mm. — Nav. O'lf. var. lab. 

 Cl. Vega p. 496. 



Marine: Labuan! 



Var. incomperta Lewis (1865). — Transverse strife about 27, longitudinal 22 to 23 in 0,oi 

 mm. — Nav. incomperta Lewis 1. c. f. 20. 



Brackish water: Atlantic coasts of U. States (Lewis). 



Var. Julieni Brun a. H^rib. (1893). — L. 0,o7; B. 0,oi2 to 0,oi7 mm. Transverse striae 

 about 28, longitudinal 20 in 0,oi mm. — N. Jul. Brun a. HMiB. D. d'Auvergne p. 199 PI. VI f. 8, 9. 



Brackish water: Auvergne, fossil! 



5. F. Lewisiana Grev. (1863). — V. linear, with broad, rounded ends. L. 0, 19 to 0,21; 

 B. 0,0.35 to 0,038 mm. Central nodule small, terminal nodules elongated and linear, at some distance 

 from the ends. Transverse strife parallel in the middle, convergent at the ends, 24 in 0,oi mm. 

 Longitudinal strife 25 in 0,oi mm. irregularly undulating. — Nav. n. sp. Lewis Proced. Ac. Nat. 

 Sc. Phil. PI. II f. 3 (1861). Nav. Lewis. Grev. T. M. S. XI p. 15 PI. I f . 7 (1863). Vanheurckia 

 Letvisiana Br^b. Ann. Soc. phytol. et microgr. Belgique Vol. I p. 202 (1868). 



Brackish water: Sierra Leone! Cameroon! India (Wallich), Batavia! Sendai, Japan, fossil! 

 Brazil (Brun Coll.)! Florida and Georgia (Lewis). 



Stenoneis Cl. N. G 



EN. 



Valve narrow, with rounded ends. Central and terminal nodules very small. Median line 

 indistinct, bordered by two strong linear silicious ribs. Structure: fine, transverse, strife. Axial 

 area indistinct. 



