KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND 27. N:0 3. 69 



mm. divergent in tlie middle, convergent at the eiids; a few shorter striic are occasionally inter- 

 calated among the median. — Pant. I p. 25 Pl. XI f. 04. II Pl. I f. 12. 



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



Var. robusta Pant. (1889). — L. 0,ii7; B. 0,036 mm. Striis 10 to 12,.'j in 0,01 mm. — 

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



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



Var. directa Pant. (1889). — V. linear, with cuneate ends. L. 0,i i ; B. 0.024 mm. Strite 

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



Brackish water: Hungary, fossil (Pant.). 



Var. minor Pant. (1889). — V. elliptic-lanceolate. L. 0,09; B. O.oas mm. Strife 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 fiud any difference of importance. 



9. N. Raeana Castr. (1886). — V. lanceolate sigmoid, twisted. L. 0,oy to 0,15; B. 0,o3 5 

 to 0,04 mm. Area narrow, somewhat dilated in the middle. Strise smooth, 4, ."i to 5 in O, o 1 mm. 

 — Pinn. Baeana 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 oontorted 

 variety. 



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

 L. 0,06 to 0,ao; B. 0, 02 to O, oss mm. Median iine with small terminal fissures. Area linear to 

 lanceolate, more or less broad. Strise 4 to 4,5 in 0, 01 mm., divergent in the middle slightly con- 

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

 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,i6; B. 0,u3. 

 Strife 6 in 0, 01 mm.). Cameroon! 



Var. americana Cl. — L. 0,09; B. 0,oi8. Stria? 7 to 8 in 0,qi mm. Area narrow. 



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



Var. bituminosa Pant. (1889). — V. elliptic-lanceolate. L. 0,056 to 0,075; B. 0,oi6 to 0,ö185 

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



Brackish water: Gyöngyös Påta etc, Hungary (Pant.). 



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

 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, 02 mm. Area wide, lanceo- 

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



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



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

 B. 0,03 mm. Area narrow, lanceolate. Strise 5 in 0, 01 mm. — Nav. De Wittiana K Am & Schultz 

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



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



Var.? aradina Pant. (1893). — V. lanceolate. L. 0,o6; B. 0,02 mm. Area broad, lanceolate. 

 Strife 5 to 6 in 0,oi mm. — Nav. aradina Pant. III Pl. XXX f. 434. 



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



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

 Area narrow-lanceolate. Strife 6 in 0,oi mm. — Nav. pJialangium Pant. III Pl. XXX f. 432. 



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



