IGO C. A. Westerlund, Synopsis MoUuscorum Extramarinor. Scandin. 



medio subretuso rostrum rotundatum v. subtruncatum fere 



basale formante; dens card, verticalis, conieus, trigonus. 



Tt/pus: C. ovalis (non ovata), ventricosa, crassa, fusca v. vi- 

 rescens, raro obsolete radiata, margine dorsali magis cur- 

 vato, iirabonibus depressis, natibus decorticatis, Icevibus; 

 long. 50—60. alt. 30-37, ext. 20—26 mm. — Eossm. Icon, 

 f. 126, 411. 



Hah. Suecia in prov. Skane et Ostergotland. — Dania in 



Sjgelland et Jylland. — Fennia meridionalis. 



Var. acutus Eossm. (Icon. £. 413, 1837): c. elongata, acute 

 ovata, ventricosa, fuscocastanea, nitida, solida, postice in 

 rostrum basale obtuse acutum, declinatum producta, margo 

 ventralis fere rectus, posterior forte arcuato-descendens, 

 umbones turgidi, area elliptica, planiuscula, dens card, sub- 

 compressus, lamellaB crassse; long. 80—87, alt. 47, cr. 36 

 mm. — Suecia in Skane (Kaflinge in amne et in palude 

 ad Dagstorp). 



Var. ruhens Mke. (Syn. 1830): c, brevis, subtrigono-ovata, su- 

 perne subventricosa, inferne complanata, fusco-nigra, an- 

 tice late rotundata, postice celeriter in rostrum basale acu- 

 minata, margo dorsalis arcuatus, ventralis rectus, umbones 

 prominuli, decorticati, dens card, subcompressus, lamellse 

 arcuatce, exsertse; long. 60, alt. 40, cr. 25 mm. — Suecia 

 in Skane (in amne ad Kaflinge). — Eossm. Icon. f. 412. 



U. barys mh. C. elongato-ovata, ventricosa, crassa, ponderosa, 

 fusco-olivacea, viride radiata, antice producta, angulata, ro- 

 tundata, superne regulariter extense convexa, postice 272 

 longior, lente utrinque in rostrum inframedianum acumi- 

 nato-rotundatum producta, margo ventralis medio rectus; 

 umbones forte undulati v. decorticati; denies card, ut U. 

 crassi, sed juxta positi et multo validiores, fossula inter- 

 posita valv. sin. lata, non profunda. Long. 70, alt. 45—50, 

 cr. 38 (100—54-42: Kob., 90—50—30: Cless.) Cfr. West. 

 Fauna paliiarkt. VII, 1890, p. 63. — U. pseudolitoralis 

 Cless. 1875, nomen hybridum! 



Hah. Dania in maxime meridionali parte peninsulae Jyl- 

 land (locus originalis est Tapsaaen '•■■ ad Kristiansfeld in maxime 

 septentrionali parte Schlesvigiae). 

 U. ater Nilss. (Hist. moll. Su. 1822). C. ovato-oblonga, antice 



