Acta Societatis pro Fauna et Flora Fennica, XIII, n:o 7. 149 



et infra medium angustata, acuminata et produeta, postice 

 latissima, margine arcuato-descendens, ad basin rotundato- 

 angulata, marg. superiore curvato ; umbones lati, breves, sur- 

 sum lente attenuati, mitrellis magnis, inflatis. Long. ^Y^i 

 alt. 6, cr. 4 mm. 



Hah. 8ii€cia in Oland (ad Bjornhofda). — Dania in Sjsel- 

 land (P\iurso, Skjelskor &c.) et Jylland (ad Viborg). 



Forma majoi^ long. 10 mm. — Dania in Sjaelland (ad Bronds- 



holmsdal et Boserup). 

 Var. stnctum Norm. ap. Cl. (Cliemn. Conch. Cab., 1877): c. or- 



bitu typi, ventricosissima, angulis rotundatis, umbonibus 



brevissimis, latissimis, mitrellis magnis; long. 5, alt. 47o, 



cr. oVs mm. — Dania In ins. Bornhohii. 



Gen. Pisidium C. Pfr. 



C. plus mimisve incequilatera (antice semper longior), 

 ligamento ])arti breviori insito. Animal siplione simplici, 

 hrevi, cylindraceo. 



1. Fluminina Cl. C. solida, costata, clentibus cardincilihus val- 

 vulfc utriiisque duobus juxta positis. 



P. amnicum Miill. (Verm. Hist. II, 1774, Tellina). C. valde in- 



gequilatera, perobliqua, ovalis, sat ventrosa, nitida, fusco- 



cinerea, zonis nigrescentibus, striato-sulcata, antice elon- 



gata, deorsum forte declivis et angustata, superne late ro- 



tundata, postice brevissima, subverticaliter truncata, 6on- 



vexiuscula, margo ventralis arcuatulus; umbones lati, pa- 



rum prominentes. Long. 11, lat. 8, cr. 6 mm. 



Hah. Suecia, forma typica in Dalarne (in par, Gustaf et 



in Ljusteran ad Siiter), in Upland (Upsala ad Flottsund) et ad 



Pitea. Nondum aliis locis peninsuhie reperta. — Dania \n Sjsel- 



land (locus orginalis Miilleri est amnis ad Fredriksdal). — Fen- 



nia in lacubus Ylane, Saimen, Ladoga et Onega (Mus. Helsingf.). 



Var. glaciale W. (Nachr. blatt Mal. Ges., 1893): c. brevior, la- 

 tior, rotundior, margiue ventrali forte arcuato, parte an- 

 teriore late rotundato; long. 9, ait. 7, cr. 3% mm. — Fen- 

 nia borealis circa 69° lat. bor. (ad Ivalojokki *, Kamasjokki, 

 Enare &c.: Ch. E.). 



