KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND 26. N:0 2. 177 



mm. a little closer towards the ends, where they are strongly radiate, distinctly punctate; puncta 

 15 in 0,01 mm. 



Fresh water: Oregon, fossil! 



63. C. mexicana Ehb. (1844). — V. lunate with rounded truncate ends. L. 0,o9 to 0,i4; 

 B. 0,026 to 0,036 mm. Median line bent, with reflexed terminal fissures. Axial area narrow 

 linear, central small, orbicular. Stigma in the middle of the central nodule, without distinct fissure. 

 Striae 7 (middle) to 9 (ends) in 0,oi mm. radiate in the middle and alternately longer and shorter, 

 nearly parallel at the ends, coarsely punctate. Puncta 12 to 13 in 0,oi mm. — Goccon. mexicanuni 

 Ehb. Ber. 1844 p. 342. A. S. Atl. X f. 32, 33; LXXI f. 82. Cynib. Mmtschatica Grun. in A. S. 

 Atl. X f. 31. 



Fresh water: Washington Territory! Vancouver Island! Mexico, Californa and Guatemala 

 fossil! Kamtschatka! 



There is, so far I can see, no other difference between C. mexicana and C. kamtschatica 

 than that the latter is somewhat smaller and has rather closer strise and puncta. 



64. C, Janischii A. S. (1881). — V. lunate, with rounded ends. L. 0,2; B. 0,o.5 mm. 

 Median line arcuate, with strong terminal nodules and reflexed terminal fissures. Axial area 

 narrow, linear, slightly dilated around the central nodule. Stigma in the middle of the central 

 nodule, without distinct fissure. Strise 8 to 9 in 0,oi mm., in the middle radiate and of unequal 

 length, towards the ends almost transverse, distinctly punctate; puncta 10 to 12 in 0,oi mm. — 

 Cocc. Jan. A. S. Atl. LXXI f. 81. 



Fresh water: Pitt River, Oregon (Grove Coll.)! San Francisco (Atl.). 



Additional. 



C. conifera Bkun (1893). — V. slightly asymmetrical, with arcuate dorsal and gibbous 

 ventral margin. Ends apiculate. L. 0,04 to 0,0 5; B. 0,oi2 to 0,oi8 mm. Median line slightly 

 arcuate, somewhat excentric. Axial area narrow, linear, not dilated around the central nodule. 

 Strise 9 to 10 in 0,oi mm., slightly radiate throughout, coarsely punctate; puncta 20 in 0,oi mm. 

 — H^RIB. D. d'Auvergne p. 220 PL VI f. 7. 



Fresh water: Cantal, fossil! 



Species not described and too imperfectly figured to be admitted in the above monograph. 



C. affinis Pant. Ill PI. IV f. 52. 



C. austriaca var. fossilis Pant. Ill PI. VIII f. 133. 



— — var. latestriata Pant. Ill PI. I f. 9. 

 C. Budayiana Pant. Ill PI. XV f. 233 (C. Ehrenbergii var.?). 



_ _ var. gracilior Pant. Ill PI. XXIV f. 363. 

 C. capitata Pant. Ill PI. X f. 160. 



C. Cistula var. hungarica Pant. Ill PI. Ill f. 40 (C. helvetica?). 

 C. dementis Pant. IJI PI. XX f. 303 (C. Cistula var.?). 

 C. cymbiformis Pant. Ill PL X f. 174. 



_ _ var. producta Pant. Ill PL XXIII f. 346. 

 C. Gfunovii Pant. Ill PL XIX f. 283 (C. Cistula var.?). 

 C. helvetica var. fossilis Pant. Ill PL IX f. 158. 

 a. inflata Pant. Ill PL VI f. 95. 

 C. Jimboi Pant. Ill PL VIII f. 130 (C. Cistula?). 

 C. KocJcii Pant. Ill PL I f . 2 (C. Cistula var. maculata?). 



K. Sv. Vet. Akad. Hand. Band 26. N:o 2. 



