180 C. A. Westerlund^ Synopsis Molluscorum Extramariiior. Scandin. 



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

 ovali-lanceolata, fragilis, venlrosula vel subcompressa, rugis 

 densis sculpta, sordide olivaceo-virescens, antice depresse 

 rotundata, postice in rostrum breve, submedianum, iate 

 conicum, apice angulatum, utrinque lineis rectis subasqua- 

 libus attenuata, margo dorsalis subrecte ascendens, poste- 

 rior sat celeriter descendens, ventralis saepissime rectus et 

 retusulus, postice oblique ad medium ascendens, area com- 

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

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



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

 Fennia ad Rantasalmi (Mus. Helsingf.) 



A. danlca Morch ap. Bourg. (MoU. Aceph. L 1881). C. 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. 



Hah. Dania multis locis (locus origin. est Hofmansgave 

 in ins. Fyen, ubi frequentissima). 



A. pulcliella Drt. (Journ. Conch. 1893). C. oblonga, ventrosula, 

 infra medium antice compressa, tenuis at firma, striato- 

 sulcatula, pallide castanea, parte posteriore limo caicareo 

 valde adha^rente 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.) 



Hah. Sitecia in Gotland (in palude ad Lojsta:* V. L.) 

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

 so et ad Frederilcsdal (H. L.). 



A. tenella (Held) Kstr. (Mon. in Chemn. Cab. 1852). C. obliqua, 

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

 ad umbones brunnea, antice prolongata, ovato-rotundata. 



