KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 69 



mm. divergent in the middle, convergent at the ends; a few shorter striiE are occasionally inter- 

 calated among the median. — Pant. I p. 25 PI. XI f. 94. II PL I f. 12. 



Marine, brackish: Hungary fossil! Atlantic City, N. Jers. U. S. Amer. foss. (Beby Coll.)! 



Var. robusta Pant. (1889). — L. 0,ii7; B. 0,036 mm. Striae LO to 12,5 in 0,oi mm. — 

 Nav. robusta Pant. II p. 53 PI. IX f. 159. 



Brackish water: Hungary, foss. (Pant.). 



Var. directa Pant. (1889). — V. linear, with cuneate ends. L. 0,ii; B. O.024 mm. Striae 

 10 in 0,01 mm. — Pant. II p. 46 PI. XII f. 211. 



Brackish water: Hungary, fossil (Pant.). 



Var. minor Pant. (1889). — V. elliptic-lanceolate. L. 0,09; B. 0,o25 mm. Strise 10 in 0,oi 

 mm. — Pant. II p. 46 PL XXVI f. 381. 



Marine: Hungary, fossil (Pant.). 



Nav. halionata is a beautiful species, akin to N. Yarrensis and N. palpebralis, but much 

 larger. Between N. halionata and N. robusta I am unable to find any difference of importance. 



9. N. Raeana Castk. (1886). — V. lanceolate sigmoid, twisted. L. 0,o9 to 0,15; B. 0,o35 

 to 0,04 mm. Area narrow, somewhat dilated in the middle. Striae smooth, 4,5 to 5 in 0,oi mm. 

 — Finn. Raeana Castr. D. Challenger p. 25 PL XV f. 3. Nav. contorta Kitton Ms. 



Brackish water; Ceylon! Singapore! Java! Sumatra! Labuan! Hongkong! 

 This remarkable form is nearly akin to N. Yarrensis, of which it is perhaps a contorted 

 variety. 



10. N. Yarrensis Gbun. (1876). — V. lanceolate, to narrow elliptical, with obtuse ends. 

 L. 0,06 to 0,'iu; B. 0,02 to 0,o3 8 mm. Median line with small terminal fissures. Area linear to 

 lanceolate, more or less broad. Striae 4 to 4,5 in 0,oi mm., divergent in the middle slightly con- 

 vergent towards the ends, where they are a little closer. — A. S. Atl. XL VI f. 1 to 6. Pant. 1 

 PL II f. 20; II PL X f. 178, XII f. 219, XVI f. 274. 



Brackish water: Kiel (Atl.), Hungary, fossil! S. Africa! Madagascar! Singapore! Ceylon! 

 Java! Japan! Australia! Florida! Atlantic City N. Jers. U. S. Amer. fossil (L. 0, le; B. 0,o3. 

 Striae 6 in 0,oi mm.). Cameroon! 



Var. americana Cl. — L. 0,09; B. 0,oi8. Striae 7 to 8 in 0,oi mm. Area narrow. 



Brackish water: Atlantic coast of U. S. Quincy Mass.! Cape May! Connecticut! 



Var. bituminosa Pant. (1889). — V. elliptic-lanceolate. L. 0,o56 to 0,075; B. 0,oi6 to0,oi85 

 mm. Area lanceolate, wide. Striae 5 to 8 in 0,oi mm. ■ — Pant. II p. 55 PL IV f. 74. 



Brackish water: (ryongyos Pata etc., Hungary (Pant.). 



Var. gracilior Pant. (1889). — V. lanceolate. L. 0,062; B. 0,oi6 mm. Area wide. Striae 

 6 in 0,01 mm. — Pant. II p. 55 PL XXI f. 323. 



Marine: Bory Dept. Hungary (Pant.). 



Var. valida Pant. (1889). — V. broad, lanceolate. L. 0,057; B. 0,o2 mm. Area wide, lanceo- 

 late. Striae 7 to 8,5 in 0,oi mm. — Pant. II p. 55 PL XII f. 212. 



Brackish water: Szurdok-Plispoki Dept. Hungary (Pant.). 



Var. De Wittiana Kain & Schultz. — V. broadly linear with protracted ends. L. 0,ii; 

 B. 0,03 mm. Area narrow, lanceolate. Striae 5 in 0,oi mm. — Nav. De Wittiana 'Kki¥i & Schultz 

 Tor. Bot. Club Aug. 1889 Vol. XVI N:o 8 p. 209 PL XCIII f. 5. 



Marine: Atlantic City, N. Jers. foss. (Deby Coll.)! 



Var.? aradina Pant. (1893). — V. lanceolate. L. 0,06; B. 0,02 mm. Area broad, lanceolate. 

 Striae 5 to 6 in 0,oi mm. — Nav. aradina Pant. Ill PL XXX f. 434. 



Marine?: Kavna-Bremia, Hungary, fossil (Pant.). 



Var.? Phalangium Pant. (1893). — Linear, with cuneate ends. L. 0,o6; B. 0,oi7 mm. 

 Area narrow-lanceolate. Striae 6 in 0,oi mm. — Nav. phalangium Pant. Ill PL XXX f. 432. 



Marine?: Kavna-Bremia, Hungary, fossil (Pant.). 



