176 C- A. Westeyhmd, Synopsis MoUuscorum Extramarinor. Scandin. 



Hab. Suecia in Skane (unde hanc formam accepi, sed lo- 

 cus specialis ignotus est). 



A. spuria Yoldi ap. Morch (Syn. Moll. Danite 1864). C. subova- 

 Hs, ventricosa, solida, postice humihor, late rostrata; 

 area subcompressa, utrinque canahculata; margo Hga- 

 mentahs ascendens, posthgamentahs leviter concavus. Long. 

 105, alt. 60 mm. Inter A. ponderosam Rossm. Ic. f. 

 282 et A. rostratam (Kok.) Rossm. Icon. f. 284 interme- 

 dia. (Morch). A, helvetica Morch (fide Bourg.). 

 Hah. Dania in Bornhohn. (Morch). 



A. tremula Drt. (Journ. Conch. 1888). C. ovahs, convexa, supra 

 infraque arcuata, antice late semicircularis, postice in ro- 

 strum attenuato-truncatum producta, sohda, ohvacea, sa^pe 

 obsolete viridi-radiata; umbones depressee, phcatulse; crista 

 plus minusve elata; margarita polychroa. Long. 90 — 95, 

 alt. 50 — 55, cr. 30 — 32 mm. Juvenis compressa, tenuis, 

 nitida, palhde virescens. 

 Hah. Dania in amne ad Soborg (H. L.). 



A. helvetica Bourg. (Mal. Quater-Cant., 1862). C. oblongo-elon- 

 gata, parum ventricosa vel compressa, sat tenuis, striis 

 incrementi sulcata, antice fusco-nigrescens, postice sordide 

 luteola, superne late decorticata, antice rotundata, superne 

 angulata, postice in rostrum elongatum, medianum, ascen- 

 dens producta; margo dorsalis subrectus, leviter lenteque 

 ascendens, e ligamento ad rostri extremitatem hians, mar- 

 gine concaviusculo, margo ventralis arcuatulus, antice ar-- 

 cuatus, postice rectus, ascendens; area compressa, humilis, 

 angulo subnullo; umbones depressi. Long. 75, alt. 40, cr. 

 22—26 (100—105 : 45—54 : 25—32 : Bgt.)^ mm. 



Hah. Siiecia in Edlosaviken prope Waxholm (R. H.). Celeb. 

 Drouet determinavit. 



A. frigida Drt. C. oblongo-elongata, ad umbones sat ventricosa, 

 infra medium forte compressa, tenuis, crebrisulcata, antice 

 castanea vel fusca, postice luteola, antice brevis, rotun- 

 data, postice fere triplo longior, in rostrum longum, late 



