Acta Societatis pro Fauna et Flora "Fennica, Xlll, N:o 7, 163 



tricosa (postice compressa), crassa, ponderosa, brunnea vel 

 rufofusca, stepius fuscoradiata et nigrozonata, antice lata, 

 rotundata, postice 2V2 longior, in rostrum acute conicum, 

 medianum, utrinque forte stricteque acuminata, margine dor- 

 sali rectiusculo, antice et postice saspius angulato, ventrali 

 plus minus arcuato ; umbones prominentes. Long. 75, alt, 

 35, cr. 25 mm. 



Hah. Suecia in plerisque provinciis merid. et mediis us- 

 que in Dalarne. — Dania in plerisque lacubus et amnibus. — 

 Fennia raerid. et media. 



Forma rnajor (Eossm. Icon. f. 402): long. 110, alt. 50, cr. 35. 



— Earior. 

 Var. mtlUeri Rossm. (Icon. t'. 5-11, 1838): c. acute ovata, forte 

 compressa, lutescens, nigricante cingixlata, antice prolon- 

 gata, late rotunclata, postice in rostrum acutum medianum 

 elongata, margine dorsali et ventrali sub^eque arcuatulis, 

 umbones tumiduli, medio approximati, dentes card. com- 

 pressi, elongati, humiles; long. 67 — 70, alt. 38 — 40, cr. 18 

 — 20 mm. — Dania. 



Forma compressa Morch (Syn. moll. Dan. 1864:): c. minus 



compressa, margine posteriore in rostrum breve coni- 



cum fere basale forte declivo, margine A^entrali sub- 



recto; long. 56—60, alt. 33, cr. 22 mm. — Dania in 



Sjselland (Tjustrupso et Bavelseso). — Eossm. Icon. f. 



739. 



Var. ovaUs Mont. (Test. Brit. 1803, Mya): c. oblique trigono- 



ovata, antice brevis, humilis, rotundata, post umbones mai-- 



gine lente regulariter arcuato-declivi et ad basin cum mar- 



gine ventrali antice arcuato-ascendente, postea recto ro- 



strum obtuse acumiuatum formante, superne ad umbones 



ventrosula. de ctetero forte complanata, lunula (superne 



ante umbones) magna, profunda, ovalis, dentes card, et la- 



mellse angulum validum profundum obtusum formantes; 



ex. max. long. 65 (ant. 12, post. 53), alt. 35, cr. 22 mm. — 



Suecia in Skane. 



Var. lacnsfris Eossm. (Icon. f. 542, 775): c. postice magis elon- 



gata et angustata, infra post medium compressa, rostro an- 



guste attenuato, inframediano apice truncato, subdecurvato, 



sulcis incrementi rostri hiantibus, iiiargine ventrali post 



medium rectiusculo, ante apicem retusulo; long. 70, alt. 



33, cr. 24 mm. — Suecia pnecipue in prov. Skane. -- Dania 



in Endrupso. 



