166 C. A- Westeyluncl, Synopsis Molluscomm Extramarinor. Scandin. 



Var. deshayesi Mich. (Compl. hist. moll. 1H31): c. elongato- 

 ovata, marginibus subparallelis, ventrali subsinuato, pars 

 posterior altior, 2^/4 longior, in rostrum acuminato-trun- 

 catum, supra et infra seque subrecte angustata, modice 

 ventricosa, viride lutescens v. brunneo-olivaceolutea, cir- 

 cuitu obscurior, umbones pone marginem anteriorem, forte 

 decorticati, margarita albocoerulea, oleomaculata; long. 70 

 — 75 (Morch), long. 90, alt. 34, cr. 25 mm. (Loc). — Dania 

 in Tonderkanal et Tingslevso. — Eossm. Icon. f. 197. 



U. limosus Nilss. (Hist. moll. Su. 1822). C. longa, fusca, antice 

 brevis, subtruncato-convexiuscula, depressa et angulata, 

 postice post mediura usque plus minusve dilatata, deinde 

 supra et infra asqualiter in rostrum late rotundatum vel 

 truncatum, ssepissime crusta obtectum, longe producta, 

 margine ventr. recto v. curvatulo, postice brevissime ascen- 

 dente, carina ligamentali obsoleta; umbones lati, rotundati, 

 prominentes; callus marginalis altus, medio obtuse angu- 

 latus. 



Typus: c. in omnibus petatibus saturate colorata, brunnea seu 



luteofusca, striis zonifoi-mibus subrugosis saturatius fu- 



scis; long. 85, alt. 35, cr. 25 mm. — Rossm. Icon. f. 199. 



Forma maxima: rugae incrementi confertissima?; long. 85 



—100, alt. 34-41, cr. 28—30 mm. 

 Forma immila: long. 39, alt. 18 mm. 



Hah. Suecia in provinciis iisdem ac U. rostratus, sed ubi- 



que rarior. — Dania in Sjtelland, Fyen et Jylland multis loeis. 



— Fennia ad Impilahti et Saaksmaki in Valkiakoski (Mus. Hel- 

 singf.). 



Gen. Nlargaritana Schum. 



C. crassa, ponderosa, dente cardinali valvce dextrce 

 siminlici, vcdvce sinistraa bipartito (vel dentibus duohus), 

 onmibus crassissimis, conicis; dentes latercdes vel lamelli- 

 formes nuUi. 



M. margarltifera Lin. (Syst. nat. X, 1758, Mya). C. ovali-oblonga, 

 compressiuscula, nigrobrunnea, margine dorsah arcum 

 circuli majoris formante, ventrali medio sinuato, unde 

 concha subreniformis; umbones depressi, ssepissime decor- 



