180 C. A. Westerhmcl, Synopsis Molluscorum Extramariiior. Scaiidin. 



A. anatina Lin. (Syst. nat. x. 1758, Mytilus). G. perobliqua, 

 ovali-lanceolata, fragilis, ventrosula vel subcompressa, rugis 

 densis sculpta, sordide olivaceo-virescens, antice depresse 

 rotundata, postice in rostrum breve, submedianum, late 

 conicum, apice angulatum, iitrinque lineis rectis subsequa- 

 libus attenuata, margo dorsalis subrecte ascendens, poste- 

 rior sat celeriter descendens, ventralis ssepissime rectus et 

 retusulus, postice oblique ad medium ascendens, area com- 

 pressa, angulata. Long. 55, alt. 32, cr. 18 mm. (A. 

 anatina v. /. Nilsson, A. anatina Rossm. Icon, f. 417). 



Hab. Suecia meridionalis et media. — Dania passim. — 

 Fennia ad Rantasalmi (Mus. Helsingf.) 



A, danica Morch ap. Bourg. (Moll. Aceph. L 1881). G. perobli- 

 qua, ovato-lanceolata, elongata, compressiuscula, tenuis, 

 antice humillima, parva, rotundata, postice in rostrum 

 latum producta, margo dorsalis rectus, ascendens, ventra- 

 lis ante medium subretusus, utrinque sensim ascendens; 

 area compressa, medio angulata, utrinque radiis binis sub- 

 elevatis remotis circumscripta. Long. 90, alt. ad umb. 

 41, postligam. 50, cr. 20 mm. 



Hab. Dania multis locis (locus origin, est Hofmansgave 

 in ins. Fyen, ubi frequentissima). 



A. pulchella Drt. (Journ. Gonch. 1893). G. oblonga, ventrosula, 

 infra medium antice compressa, tenuis at firma, striato- 

 sulcatula, pallide castanea, parte posteriore limo calcareo 

 valde adhserente forte obtecta, in rostrum latum medianum 

 producta, margo dorsalis arcuatus, ventralis rectiusculus; 

 nates depressse; crista prominula. Long. 70 — 77, alt 40 

 —45, cr. 20—22 mm. (West. 1. c.) 



Hab. Suecia in Gotland (in palude ad Lojsta:"^ V. L.) 

 et ad Stockholm (in Lidingon: Hj. W.) — Dania in Haraldsted 

 so et ad Frederiksdal (H. L.). 



A. tenella (Held) Kstr. (Mon. in Ghemn. Gab. 1852). G. obliqua, 

 oblonga, convexa, tenuis, marginibus acutis, olivaceo-lutea, 

 ad umbones brunnea, antice prolongata, ovato-rotundata, 



