KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 163 



Strise 9 or 11 (middle) to 12 (ends) in 0,oi mm. slightly radiate, especially near tlie ends, punctate; 

 puncta about 22 in 0,oi mm. — Cocc. lepf. Ehb. Am. Pl. I: 2 f. 30. Cy. leptoc. V. H. Syn. p. 62 

 Pl. Il f. 18, III f. 24 (f. curta) Suppl. A. f. 2 (f. elongata). Cij. hungarica Pant. II p. 40 Pl. I 

 f. 14 (1889)? 



Fresh water: Rostock (foss.), Eelgiuml Hungary fos.s. (Pant.)? Mexico, fos8.! 



Var. minor Grun. (1882). — L. 0,026; B. 0,oo7 mm. — Grun. Foss. D. Österr. Ung. p. 142 

 Pl. XXIX f. 32. 



Fresh water: Hungary. fossil (Grun.). 



Var. anf/nsta Grun. (1882). — L. 0,(i24 to O.04 ; B. 0,oo5 to O.oi mm. Strife 12 to 15 in 

 0,01 mm. -- Grun. Foss. D. Österr. Ung. p. 142 Pl. XXIX f. 33, 34. 



Fresh water: Gi'eenland! IIungar3^ fossil (Grun.), Geneva! Savoyl 



Var. exci.sa Pet. (1877). — Ventral margin indented in the middle. — C. turgida var. excisa Pet. 

 Bull. Soc. Bot. de France 1877 Pl. I f. 2. A. S. Atl. LXXI i. 35. Grun. Foss. D.' Österr. Ung. p. 142. 



Fresh water: Marly, near Paris (accoi'ding to (irunow). 



The most marked characteristic of C. h-ptoccros is the distinct axial area, whicli seems to 

 become much reduced in some of the varieties, named by Grunow, especially in the var. excisa 

 which I have placed here on the authority of Grunow. Specimens of that var. from Marly (Cl. M. 

 D. N:o 195) agree in my opinion with C. fmnidula Grun. 



The foilowing forms, found in a fossil state in Hungary and described by Pantocsek seem 

 to be nearly akin to C. leptocrros. 



C. kcn-neusis Pant. (II p. 40 Pl. XI f. 186). — L. 0,o2.'i; B. 0,oi)-.'> mm. Stritu 15 in 0, 01 mm. 



C. yeiqjaueri Pant. (II p. 40 Pl. XI f. 187). — L. 0,027; B. 0,009.5 mm. Strite 15 in 0, 01 mm. 



Specimens from Gyöngiös-Pata, which I have examined, are scarcely distinguishable from 

 C. leptoceros in Van Heurck's Types. 



15. C. iuistriacii Grun. (1875). — V. asynnnetrical ; with arcuate dorsal margin and slightly 

 convex ventral margin. Ends obtuse and rounded. L. 0, 04 5 to 0,068; B. 0,oi2 to 0,oi7 mm 

 Median line somewhat excentric, nearly straight, broad (obliqne). Axial area distinct, linear, not 

 widened in the middle. Strife 11 or 13 (dorsal) to 13 or 14 (ventral) in 0, 01 mm., radiate through- 

 out, punctate; puncta about 21 in 0, 01 mm. — Grun. in A. S. Atl. IX f. 10, LXXI f. 67 to 69. 



Fresh water: Tj^rol (Atl.), Switzerland (St. Gingolf, Engadine)! 



Var. prisi-a Grun. (1882). — L. 0,o5 to 0,o78; B. O.oi:? to 0,oi9 mm. Median line slightly 

 arcuate. Area slightly dilated 011 the dorsal side of the central nodule. Stria^ 9 (middle) to 11 

 (ends) in 0, 01 mm., punctate. Puncta 23 in 0, 01 mm. — Grun. Foss. D. Österr. Ung. p. 143 

 Pl. XXIX f. 29. 



Fresh water: Hungary, fossil (Grun.). 



Var. excisa Grun. (1882). — Smaller. Ventral margin indented. — Grun. Foss. D. Österr. 

 Ung. Pl. XXIX f. 27. Pant. III Pl. I f 11. 



Fresh water: Hungary, fossil (Grun.). 



C. austriaca, which seems to inhabit the alps only, is characterized by its median line, being 

 oblique and therefore broad in the middle between the central and terminal nodules, by its dis- 

 tinctly punctate striae and non-rostrate ends. It is evidently akin to C. leptoceros. Cymh. Erdöben- 

 yana Pant. (II p. 40 Pl. XI f. 198; 1889) agrees completely with O. austriaca, as I have convinced 

 myself by examining specimens from Erdöbenye. 



16. 11. Stodderi Cl. (1881). — V. slightly asymmetrical, narrow, lanceolate, with subrostrate 

 ends. L. 0, 075 to 0,09; B. 0,oi5 mm. Median line almost central, straight; its terminal fissures 

 approximate to the ends. Axial area moderately broad, linear-lanceolate. not abruptly dilated 

 around the central nodule. Strise strongly radiate in the middle, 10 or 11 (middle) to 12 (ends) 

 in 0,01 mm., not distinctly punctate. — Cl. N. E,. D. p. 5 Pl. I f. 5. Cl. M. D. N:o 212, 274. 



Fresh water: Monmouth (Maine), Bemis Lake (White Mountains)! Caldas (Brazil)I 



