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



rotundate angulata, postice supra et infra angulata; iiin- 



bones lali, tumidi, convexiusculi. Long. 3, alt. 2^3, cr. 



l^/e mm. 



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

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

 backen ad (lOteborg et Boras), Bohusliin (in rivulo ad molinam 

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

 ad Stockholm (Gangsiitra: 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 Sjielland (Jonstrup Hegn, Sorup, Kjobenhavn) et in 

 Jylland (Worsens): H. L., nee non in Fyen et Bornholm. — 

 Fennia in palude Maljalampi pr. Kuopio et ad Vosnesenje in 

 Oiiega (Mus. Helsingfors). 



Var. oidaleum C. G. West. (Eonnel3y Flora ocli Fauna 1890): 

 c. valde ventricosa, maxime paullisper sub medio, delude 

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

 formantibus, forte striata et iiitidissima, antice abbreviata. 

 parte posteriore tantum paullo lougior. umbones lati, ro- 

 tuudati, superne ssepius pnerupti. — Suecia ad Ronneby (in 

 lacu Langasjo). 

 Var. itnioiVZe.s 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). 



^>f^>fij Q subGrbicuIato-ovalis, umhonibus magis medianis, yarte 

 anteriore tantum imullo longiore et angustiore, margine 

 superiore et anteriore bene, i^osteriore et inferiore forte 

 arcuatis. 



P. obtusale (Lam?) C. Pfr. (Naturg. D. Moll. 1. 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. 372, alt. 2Y2, cr. 



