KONCL. SV. VET. AKADKMIENS IIANDLINGAU. HAND 26. N:0 2. 53 



11. €.? elongsitula Pant. (18S9). — V. linear, with roundod ends. L. 0,021; B. 0,(m)8 mm. 

 Axial area indistinrt; central small, orbicular. Striie 2U in (),oi mm. parallel. Longitudinal lines? 

 — Nav. elonfjatiila Pant. II p. 45 PI. Ill f. 40. 



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



The tig. of this species in Pantocseks work is not sufficient for determining the systematical 

 place of this form, which seems to be related to C. SilkuUi. I have found in the deposit of Gyon- 

 gyos Pata (Hungary) a foi'm, which agrees with N. clov(/(itu(a in outline and in the number of 

 stria', but is 0,04 mm. in length. In this form the striai on both sides of the central nodule are 

 interrupted by a short lunate, longitudinal line. 



12. €. Schuinainiiana Grun. (ISSO). ~- V. strongly inflated in the middle, with rounded 

 obtuse ends. L. 0,0,37 to 0,05; B. 0,oo',» to 0,0 i.i mm. Axial area indistinct or narrow. Central 

 area lanceolate with a lunate marking on each side of the central nodule. Stria? 17 in 0,oi mm., 

 radiate at the ends (very finely punctate?). Longitudinal lines indistinct. — Nav. Trochus Schum. 

 P. D. I p. 1H9 f. 52. (tREo. M. .1. IV PI. I f. 2 (1856). Nav. Schumanmana Grun. V. H. Syn. 

 p. 09 PI. XI f. 21. 



Fresh water: Sweden, Ringsjon in Skane! Ladoga! Konigsberg, fossil! 



Var. frinoilis Lewis (1861). — V. divided by two constrictions into three segments of equal 

 size. Ends cuneate. L. 0,034 to 0,042; B. O,oii mm. Stride 18 to 20 in 0,oi mm. strongly 

 radiate in the middle, almost parallel in the terminal segments. — Nav. frinodis Lewis Proc. 

 Ac. n. sc. Philad. p. i^i) PI. II f. 6 (1861). — Nav. hiconstrida Grun. Casp. S. Alg. p. 15 PI. Ill 

 f. 6 (1878). 



Fresh and brackish water: Caspian Sea (Grin.) N. Ameri(^a, Hudson River! Delaware! Da- 

 kota! Lake Pistaku, Illin.! Lost .spring Ranch, Calif.! 



13. €.? bodosensis Pant. (1893). — V. trochiform, obtuse. L. 0,077; B. 0,02 mm. Axial 

 area lanceolate, dilated in the middle to a transverse fascia, and with an elongated marking on both 

 sides of the central nodule. Stria'. 17 in 0,01 mm. almost parallel. — Nav. Ixxlos. Pant. Ill 

 PL III f. 35. 



Habitat?: Bodos^ (Pant.). 



Var. Herihaudi Per. (1893). — V. in L. 0,07 to 0,o'.); B. 0,oi6 mm. biconstricted. StritB 17 

 in 0,01 mm. — Nav. Her. Perag. in Herib. D. d'Auvergne p. 112 PI. IV f. 8. 

 Fresh water: Puy de Dome. Varennes (Brun Coll.)! 



14. ('. alpestris Grun. (1860). — V. linear, slightly gibbous in the middle, with rounded 

 or .subcuneate ends. L. 0,(in to 0,o76; B. 0,oo6 to 0,oo9 mm. Axial and central area united in 

 a narrow lanceolate space, having on each side of the central nodule a lunate marking. Striffi 20 

 in 0,01 mm. nearly parallel; slightly divergent at the ends. Longitudinal lines distinct, submar- 

 ginal. - Nav. alpcstris Grun. Verb. 1860 p. 545 PI. V f. 4. V. H. Syn. PI. XII f. 30. 



Fresh water, alpine regions: Swedens Lake Malaren (in postglacial mud!), Austrian alps, 

 (Grun.), Savoy! 



Nav. alpestris var. tairica GuTW. p. 20 PI. I f. 17 — is no var. of C. alpcsiris and appears 

 to be a Frustulia or Neidium, impo.ssible to decide from the figures. 



15. €. niibicola Grun. (1880). — V. .slightly triundulated. Central area dilated transversely 

 to a fascia, with lunate markings on both sides of the central nodule. — Nav. nuhicola Grun. 

 in V. H. Syn. Index to PI. XII f. 30. 



Fresh water: Turkestan (Grun.). 



16. €. Kaiuitzii Pant. (1893). — V. elongated, gibbous in the middle, with broad, obtuse 

 ends. L. 0. los; B. 0,02 mm. Axial area broad, linear-lanceolate, with an elongated marking on 



