KoNCiL. SV. VET. AKADP^MIENK HANDLINGAK. BAND 26. N:() 2. 1 f)0 



Var. ln'rcijHica A. S. (187f)). — V. rostrate. L. OjOj'.i; B. (l,oi nun. Stri;r filjoiit \'A in 0,01 mm. — 

 (J. here. A. 8. Atl. IX f. iiO, ol. C. ahyssiniea Grun. in Martelli Florula bogosemsis p. 1;')! PI. 1 f. ;U1^8(>)- 

 Fresh water: Juliushall, Harzhnrg (Atl.), Ringsjon (Sweden)! Abyssinia ((4riin.). 



22. C. lata (jRUN. Ms. — V. slightly asymmetrical, I)roa(lly lanceolate, with subrostrate to 

 rostrate ends. L. 0,042 to 0,o.'j6; B. (),()i(i to (),()i8 mm. Median line almost straight and central. 

 Axial area naiTow, linear, slightly dilated around the central nodule. Stj'ia' !• (middle) to 12 (ends) 

 in (»,(»! mm. slightly radiate in the middle, almost parallel at the ends, tincdy punctate. — PI. IV f. 27. 



Fresh or slightly brackish water: Sweden ((tuU' of Bothnia at Pitea; Ore .sjo, near Boras)! 

 Ladoga! Domblitten, Rostock and Liinel)urg, fossil! 



This .species i-esembles in outline C. Ehrenherijii, but is much smaller and has less distinctly 

 punctate stria'. 



28. €. ('iiciiiiiis A. S. (1S75). — V. broad, with convex dorsal and almost straight or slightly 

 convex ventral margin. Ends rostrate-truncate. L. 0,07 to <),()(); B. (),(il'4 mm. Median line almost 

 central, slightly arcuate. Axial area narrow, slightly dilated around the central nodule. Strife 

 S to (dorsal) to 10 (ventral) in 0,01 mm. punctate; puncta 12 in 0,01 mm., more distant on the 

 median ventral stria-. — A. S. Atl. IX f. 21, 22. 



Fresh water: Bengal (Atl.), (Jameroon! 



24. €. Ehr<'iibergii Kirrz. (1844). — V. asymmetrical, elliptic-lanceolate, with slightly 

 rostrate, obtuse ends. L. O.o'.i t(j 0,14; B. 0,028 to 0,o:is mm. Median line slightly excentric, 

 straight. Axial area narrow, hut distinct, slightly dilated around the central nodule. Strite 7 to 

 9 in 0,01 mm. slightly radiate throughout, coarsely punctate; puncta 13 to 16 in 0,oi mm. — 

 Navie. incequalis EiiB. Inf. PI. XIll f. IS (1«3S). Cymh. Ehrenh. Kiixz. Bac. p. 79 PI. VI f. 11. 

 W. Sm. B. D. I PI. II f. 21. A. S. Atl. IX f. H to 9; LXXI f. 74. V. H. Syn. p. (U PI. II f. 1. 



Fre.sh water: Iceland! Sweden (from Lapland to Skane)! Norway! Finland! England! Bel- 

 gium (V. H.), Paris! (lermany! Switzerland! North America (Crane Pond, Lost Spring Ranch, 

 Washington territory, St. Rosa Cal.)! 



Var. delecta A. S. (1875). — V. asymmetrical-lanceolate, with slightly rostrate ends. L. 0,063 

 to 0,08 5; B. 0,0 1 <> to 0,024 mm. Axial area narrow, not, or slightly, dilated around the central 

 nodule. Stria'. 8 to 9 (middle) to 11 (ends) in 0,oi mm. — Cijmh. deleefa A. S. Atl. IX f. 17. 

 C. Eltreiibenjii ear. Atl. LXXI f. 80. C. Ehrenh. car. minor V. H. Syn. II f. 2. 



Fresh water: Greenland! Konigsaue (Atl.), Puerto Monte, Chili (Atl.), Victoria, Splitters 

 Creek (Austr.)! 



if}. ('. lapponica Grin. (1879). — V. almost symmetrical, sublanceolate, gradually tapering 

 from the middle tcj the acute ends. L. 0,o:!3 to 0,0:37; B. 0,oo8 to 0,0085 mm. Median line almost 

 central, straight. Axial area narrow; central area rather large, rounded. Median stria- 16 iji 

 0,01 mm., terminal stria- about 21 in 0,oi mm., finely jmnctate. — Grun. in CI. M. I). N:o 271. 

 PI. IV f. 28. 



Fresh water: North Iceland! Repats in Gellivare, Lulea Lapmark,. fossil, Sweden! 



This species has never been described or figured, but I suppose that Grunow denotes this 

 form, which occurs sparingly in CI. M. L). N:o 271. This species seems to connect C. Cesatii with 

 C. stanroiuiforiiii.s. 



2{^. V. staiiroiieiforinis Lagst. (1873). V. lanceolate, almost symmetrical, with nearly 



obtuse, attenuated ends. L. 0,();!8 to 0,o4; B. 0,oo9 to 0,oii mm. Median line almost central, 

 straight. Axial area very narrow; central area lai-ge, quadrate, somewhat bi-oader outwards, not 

 reaching to the margins. Stria? 16 to 17 in 0,oi mm., slightly radiate, finely punctate. — Lagst. 

 Spitsb. D. p. 46 PL I f. 1.5. A. S. Atl. LXXI f. 62, 63. 



Fresh water: Beeren Eiland (Lagst.), Spitsbergen! 



