Acta Societatis pro Fauna et Flora Fennica, XIII, N:o 7. 171 



(3) C. magna, parum ventrosa, longa vel longissima, marginihus 

 plus minus parallelis vel convexiihsculis, parte posteriore 5^2 — 

 3^/.7 longiore; area humilis: umhones depressi. 



A. sulcata (Lam.) Nilss. (Hist. Moll. Su. 1822). C. recta, ovali- 

 oblonga, ventricosa, humilis, olivaceo-viridis, fusca, extus 

 intusque rugata, interstitiis rugarum excavata, antice fere 

 rotundata, postice fere triplo longior, in rostrum longum, 

 medianum, rotundato-truncatum, superne lente, infra cele- 

 riter attenuata, margo superior strictus, horizontalis, ven- 

 tralis vix arcuatulus, postice recte alteque ascendens. Long. 

 110—150, alt. 50—70, cr. 30—55 mm. A. cellen.sis Auct. 

 (non Mytilus zellensis Gmel. 1788 = Mya arenaria Schro- 

 ter 1779, fide E. v. Martens in Nachrichtsbl. Mal. Ges, 

 1891). 

 Hab. Suecia meridionalis et media ad Dalarne et Upland. 



— Dania multis locis. — Fennia in Aland (in palude ad Bolsta- 



holm: Mus. Helsingf.). 



A. moulinsiana Dup. (Hist. moll. Fr. 1852). C. ovali-oblonga, 

 parum ventrosa, antice perbrevis, subtruncato-rotundata, 

 postice 3^/^ longior, in rostrum submedianum longum trun- 

 cato-biangulatum producta, brunneorufescens, margine dor- 

 sali leviter arcuato, ventrali subparallelo usque ad finem 

 recto; umbones marg. anterior. valde approxiraati, depressi, 

 decorticati; area humilis crista vix conspicua. Long. 75 — 

 90, alt. 40—4-5, cr. 20—25 mm. 

 Hah. Suecia in Skane (Ifosjon ad Bomolla: Hj. W.). — 



Fennia in lacu Lojo in Nyland, in palude Kakskerta et in amne 



Ylane (Mus. Helsingf.). 



A. cariosa Kstr. (Mon. in Gliemn. Gab. 1852). C. longa, humi- 

 lis, linguseformis, oHvaceo-brunnea, fusca, postice viride- 

 radiata, antice semicircularis, postice 3—3^/4 longior, in 

 rostrum longum, latum, rectum, forte compressum pro- 

 ducta, margine dorsali leviter arcuato, ventrali elongato- 

 arcuato, medio sa-pius impressulo; umbones anteriores, 

 non prominentes, late erosi; margarita alba, oleomaculata. 

 Long. 100—125, alt. 50 — 58, cr. 25—35 mm. 



