Acta Societatis pro Fauna et Flora fennica, XIII, n:o 7. 187 



viridis, rugis incrementi concentricis postice et infra den- 

 sissimis, pars anterior lata, declive rotundata, posterior 

 triplo longior, rosto abbreviato, inframediano, margo dor- 

 salis totus curvatus, ventralis rectiusculus, medio retusus; 

 regio Limbonalis late decorticata; area eompressa, humilis, 

 vix angulata; ligamentum breve, flavorufum. Long. 70—80, 

 alt. 40 — 50, cr 25 ram. (West. 1. c). 



Hah. Fennia in lacu Kallavesi*, ad Kuopio, et in Satakunta 

 (Mus. Helsingf.). 



A. planulata Drt. (Journ. Coneh. 1893). C. obliqua, ovalis, supra 

 medium ventrosula, de caetero eompressa, tenuis, oliva- 

 cea, dimidio postice fusco-nigra, multoannulata, rugis tenui- 

 bus acutis densis, antice brevis, depresso-rotundata, postice 

 triplo longior, rostro inframediano, late truncate, margo 

 dorsalis arcuatus, posterior rectus, longus, lentissime de- 

 scendens, ventralis rectiusculus, postice paullisper ascen- 

 dens; umbones depressi, decorticati; area humilis, vix 

 angulosa; ligamentum breve, fuscocastaneum; margarita 

 grosse maculata. Long. 85. alt. 50, cr. 25 mm. 



Hah. Snecia in Jemtland (in Hornsjon ad Brunflo: E. N.) 

 — Fennia in lacu Kallavesi *, ad Kuopio, et in Korpo (Pensar) 

 (Mus. Helsingf.). 



(14) C. perobliqiia, ahhreviata ef alta, parurn ventricosa^ antice 

 alta, rotundata, postice perhrevis^ sesqui longior^ celeriter pro- 

 fundeque in rostrum subbasale desinens; margo ventralis totus 

 subrectus; area S(ppe elata, angulata. 



A. callosa (Held) Kstr. (Mon. in Chemn. Gab., 1852). C. ovali- 

 rhomboidea, solida, striata, rugis paucis, antice olivaceo- 

 virescens, postice ferruginea; ligamentum validum, lunella 

 parva; callus marginalis validus, latus. Long. 77, alt. max. 

 50, cr. 22 mm. (1. 90, a. 55—60 mm.: Morch). — A. ma- 

 cula V. 1 Morch (fide Bourg.). 



Hah. Dania in Jylland (Aero, Nonboso, Yiborgso). 



A. orbicularis Drt. C. suborbicularis, a}quiconvexa; crassula, 

 striatula, lutea, brunneo-zonatula, antice late semicircularis, 



