Acta Societatis pro Fauna et Flora Fennica, XIII, n:o 7. 157 



rotundate angulata, postice supra et infra angulata; um- 



bones lati, tumidi, eonvexiusculi. Long. 3, alt. 273, cr. 



IVg mm. 



Hah. Siiecia in Skane (Lund, Helgea, Ronnea), Blekinge 

 (Ronneby plur. locis, Augerum etc), Westergotland (in Qville- 

 backen ad Goteborg et Boras), Bohuslan (in rivulo ad molinam 

 Skafto), Ostergotland (Omberg, Mjolsefall), Dalsland (Billingfors), 

 ad Stockholm (Gangsatra: V. L.), Upland (Harg-), Westerbotten 

 (in Sandon pr. Pitea). — Norvegia multis locis, ut Bergen, Skien 

 (in Limkjern), Arendal, Kristianssand, Kristiania, Norderhoug, 

 Ringebu, «Kjemso» ad Koppang, Gravdal in Valders etc. — 

 Dania in Sjaelland (Jonstrup Hegn, Sorup, Kjobenhavn) et in 

 Jylland (Horsens): H. L., nec non in Fyen et Bornholm. • — 

 Fennia in palude Maljalampi pr. Kuopio et ad Vosnesenje in 

 Onega (Mus. Helsingfors). 



Var. oidaleum C. G. West. (Eonneby Flora och Fauua 1890): 

 c. valde ventricosa, maxime paullisper sub medio, deinde 

 valvis subplanis augulum maximum (c. 130°) ad marginem 

 formantibus, forte striata et nitidissima, antice abbreviata, 

 parte posteriore tantum paullo longior, umbones lati, ro- 

 tundati, superne ssepius pra?rupti. — Suecia ad Ronneby (in 

 lacu Langasjo). 

 Var. imioides West. (Fauna Suec. 1873) : c. orbitu Unionis crassi, 

 parte anteriore multo longiore et acutiore, margine poste- 

 riore forte arcuato, sed margine ventrali fere recto, um- 

 bones prominentes. — Suecia in provinciis quam maxime 

 borealibus, Lappland, Jamtland et Norrbotten. — Norve- 

 gia ad Bergen et Arendal. — Fennia in Car. ross. ad Tjudi 

 (Mus. Helsingfors). 



****/' C. suborbiculato-ovalis, umbonibus magis medianis, parte 

 anteriore tantum paullo longiore et angustiore, margine 

 superiore et anteriore bene, j^osteriore et inferiore forfe 

 arcuatis. 



P. obtusale (Lam?) C. Pfr. (Naturg. D. Moll. L 1821). C. subor- 

 biculata, tenuis, tenuissime striata, nitidula, tantum antice 

 superne minute angulata, sat regulariter forte ventricosa, 

 fere infra medium maxime, valvis ad marginem ventralem 

 angulum obtusum (90° — 125°) formantibus; umbones va- 

 lidi, convexi, lati, prominentes. Long. Sy^. ^ilt. 27^, cr. 

 2Vio mm- 



