Acta Societatis pro Fauna et Flora Fennica, XUI, n:o 7. 151 



— 4, cr. 272 — '^ ^^^^- — Forma fere P. obtusali sed den- 

 ies alii. 



Hah. Suecia in Dahlsland (ad Iliistefjord), in Dalarne (ad 

 Sater, Hedemora ut etiam in regione alpina in Idre), ad Stock- 

 holm (Caiiberg: J. W.), in Wermland (ad Arvika), Gestrikland 

 (ad Gefle), Gotland. — Norv. meridionalis, saltem ad 62° lat. 

 bor. cum obtusali et fontinali frequentissima species sui generis. 

 — Fennia in Kuopio (K. M. L.), ad Kinnula in Maaninka et ad 

 Kaschkarantsa peninsulse Kola (Mus. Helsingf.). 



3. Fossarina CI. C. tenuis, striata v. striatula, dentibus car- 

 clin. valvulce sinistrce 5, jione positis, dente valv. dextrw 1. 

 f C. umbonibus superne plica compressa longitudinali pro&ditis. 



P. henslowianum Shepp. (Trans. Linn. Soc, 1823, Tellina). C. 

 elongato-ovata, parum ventricosa, medio maxime, tenuis, 

 dense regulariter striata, antice elongata, sat attenuata, ro- 

 tundata, margine superiore lente longeque arcuatulo-de- 

 clivi, postice brevis, rotundata, margine inferiore extense 

 curvato; umbones prominentes paullo acuminati. Long. 5, 

 alt. 4, cr. 2V2— 3 mm. 



Hah. Suecia sparsim et plerumque sat raro in Skane, 

 Ostergotland, Westergotland, Nerike (ubi vulgatissima species 

 sui generis), ad Stockholm, in Upland, Gotland et Westerbotten 

 (in Sandon ad Pitea). — Norv. ad Bergen. — Dania in Sjsel- 

 land pluribus locis (H. L.), Fyen (ad Nyborg). 



Var. suecicum CI. ap. W. (Fauna Suec, 1873): c. minor, ovalis, 

 parum producta et parum angustata, perlate rotundata, 

 umbones prominentes, ad partem posteriorem magis ap- 

 proximati, plica umbonali vaUda; long. 4, alt. 3, cr. 2-/^ 

 mm. — Suecia ad Goteborg (in Qvillebacken *). P. henslo- 

 wianum Malm. 



ff C. umbonibus non pliciferis. 



"^y C. rotundafo-ovata, umbonibus ad partem posteriorem 

 approximatis, antice producta, rotundato-acumlnata, po- 

 stice abbreviata, rotundato-truncata. 

 a- — C. striatula. 



P. parvulum CI. ap. W. (Fauna Suec, 1873). G. orbiculato- 

 ovalis, ventricosissima, fragillima, antice rotundato-acumi- 

 nata, postice rotundata, paullisper truncata, margine su- 



