KONGL. SV. VET. AlvADEMIKNS IIANDLINGAH. BAND 27. N:0 3. 1(11) 



radiate and distinctly piinctate. Marginal area narrow. — T. M. S. IX p. 73 PI, VllI f. l!i. 

 A. S. Atl. CXCm," 34. Icon. n. PI. II f. 3(i, 37. C. distans G-reg. D. of Clyde ]). 4iH) !»]. IX 

 f. 23 (18r)7). Pritcli. Inf. PI. VII f. ;'.«. C. rnialis Pek. D. (h; Villefranclie p. 37 PI. II f. 12? 



Marine: Coasts of Scotland (Greg, Grev.) and Norway! Balearic Islands! (ialapagos Islands! 



2. C. Pedicnlus Eiii'., (1S3S). — Outline broadly elliptical, fre(|uently subrhoin])oidal oi' 

 malformate. L. 0,015 to <*,(i.'i; B. 0,01 to 0.02 mm. Upper V. with a linear, axial area somewliat 

 constricted in the middle. Strife 17 to IS in O.di mm. finely punctate; ])uncta foi'ining luuiulate, 

 longitudinal rows. Lower V. fre([uently with traces of a loculiferons rim. Axial area indistinct. 

 Central area small, suborbicular. Striiu 16 to 17 in 0,ni mm. finely punctate, radiate, not reaching 

 to the margin, where is a hyaline, narrow rim. Annulus with rudimentary loculi. — Inf. p. 194. 

 PI. XXI f. 11. W. Sm. B. D. 1 PI III f. 31. V. H. Syn. p. 133 PI. XXX f. 28 to 30. A. S. 

 Atl. CXCII, i^Q, 58 to 63. Cocc. sigmoidea Schum. P. D. II Nachtr. PI. I f. 14? (J. tenera SciiUM. 

 II Nachtr. p. 54 f. 15? C. Placentula var. haltica Dannf. p. 14 PI. I f . 1 (1882)? C. excentrica 

 GuTW. Mater, p. 27 f. 22? 



Fresh or brackish water: throughout Europe! Baltic! ('a.spian Sea (Grun.)! Michigan! 

 Ecuador! 



Var. Salinarnm Pant. (1889). — L. 0,o2i; B. 0,oi2 mm. Strite of the lower valve 25 in 

 0,0 1 mm. — Pant. II p. 58 PI. XXVII f. 393. 



Brackish water: Hungary, fossil (Pant.). 



3. €. Placentula Ehb. (1838). — Outline elliptical. L. 0,oi2s to OjOS.'j; B. 0,oo8 to 0,o2 

 mm. Upper V. with narrow, linear, not constricted, axial area. Strife 25 in 0,oi mm. finely 

 punctate; puncta forming undulate, close longitudinal rows. Lower V. with distinct marginal 

 line, frequently also a loculiferons rim (loculi 15 in 0,oi mm.). Median line straight, not reaching 

 to the ends. Strife 23 in 0,oi mm. — Inf. p. 194. W. Sm. B. D. I PL III f. 32. V. H. Syn. p. 133 

 PI. XXX f. 26, 27. A. S. Atl. CXCII, 38 to 51. C. punctata Schum. Tatra D. p. 60 PI. II f. 20. 

 C. producta A. S. Atl. CXCI, 2. 



Fresh or bracki,sh water: throughout Europe! Baltic! Caspian Sea (Grun.), Ta.smania! New 

 Zealand! Illinois! California! Mexico! Ecuador! 



Var. intermedin HiiiRiB. a. Perag. (1893). — L. 0,o5 to 0,0 7 mm. Upper V. with coarser 

 rows of puncta, 12 (margin) to 15 (axial part) in 0,oi mm. — (J. intermedia H^rib. a. Perag. D- 

 d'Auvergne p. 44 PI. Ill f. 1, 2. 



Fresh water: Puy de Dome, fossil. 



Forma minor Hi^rib. a. Perag. 1. c. L. 0,o2 to 0,o3 mm. 



Fresh water: Puy de Dome, fossil. 



Var liouxii Brijn a. Hi^rib. (1893). — L. 0,04 to 0,09; B. 0,025 to 0,055 mm. Upper V. 

 with coarse striae, about 14 in 0,oi mm. crossed on each side of the axial area by 5 to 6 blank 

 undulating bands. Lower V. with about 14 strife in 0,oi mm. Their puncta about 16 in O.oi 

 mm. — C. Uonxii Br. a. Hi^rib. D. d'Auvergne p. 45 PI. I f. 3. 



Fresh water: Auvergne, Puy de Dome fossil and living. 



Var. trilineata HiiiRrB. a. Perag. (1883). — L. 0,o2 to O.025; B. 0,oi to 0,oi3 mm. Upper 

 V. with about 16 stria' in 0,oi mm. crossed by 3 broad longitudinal, blank bands. Lower V. with 

 15 to 17 strife in O.oi mm. — C. trilincatus H^RIB. a. Perag. D. d'Auvergne p. 47 PI. Ill f. 4, 5. 



Fresh water: Puy de Dome fossil. 



Var. lincata Ehb. (1^43). — L. 0.04 to 0,ot; B. 0,o3 to O.04 mm. Strife of the upper valve 

 punctate, puncta forming 4 to 6 longitudinal, undulating rows. Strifi; of the lower valve 17 in 0,oi 

 mm. — C. lincata Ehb. Am. p. 81. V. H. Syn. p. 133 PI. XXX f. 31, 32. C. lin. var. minor 

 Pant. Ill PI. XXI f. 311 (1893). C. lin. var. pygmea Pant. 1. c. PI. VIII f. 140. 



Fresh water: Belgium (V. H.), Mexico, Oregon, Guatemala, foss.! 



K. ,Sv. Vet. .^kad. Jl.aiull. Band 27. N:o 3. 22 



