Acta Societatis pro Fauna et Flora Fennica, XIII, n:o 7. 185 



(12) C. obUqiia, margine dorsali subrecte ascendente, rostrum breve, 

 inframedianum, obtusum, margo ventralis regulariter curvatus, 

 utrinque subcequaliter ascendens, pars posterior 2 — ^'^l^longior, 

 area modica, parva. 



A. maculata Shepp. (Trans. Linn. Soc. 1820, Mytilus macula). 

 C. parum obliqua, ovato-rhombea, fere compressa vei 

 regulariter ventrosula, tenuis, rufescenti-viridis, radiata, 

 antice rotundata, postice plus quam 2^2 longior, rostro 

 brevi, inframediano, obtuso, desuper attenuato, margo dor- 

 salis rectiusculus, parum ascendens, posterior concavius- 

 culus, forte et longe descendens, ventralis regulariter arcua- 

 tulus, postice leviter ascendens; area sat magna. Long. 

 62, alt. 34, cr. 16 mm. (70—80, 45, 20—24 mm.) Ami- 

 ciss. 0. Morch in Syn. Moil. Danice sua ut typum hujus 

 speciei figuram 281 superne ad dextrum in Iconographia 

 Rossmassleri citavit et quattuor formas huc pertinentes 

 retuHt: 1. C. flavescens radiis obsoletis; 2. C. solida, 

 planior, subunicolor (de qua partim amic. Clessin suam 

 A. morchianam creavit); 3. C. suborbicularis, complanata, 

 flavescens, unicolor, et 4. C. obscureviridis, natibus ferru- 

 gineis, margine ventrali medio subretuso, postice subito 

 ascendente. 

 Ha h. Siieda in Blekinge (in Herrstorpsjon ad Ronneby). 



— Dania in Sjpelland, in multis lacubus. 



A. sedentaria (Mab.) Bourg. (Moll. Aceph. L 1881). C. bene 

 obhqua, ovalis, ventricosa, pra^cipue superne, sat forte 

 striata, ad oras squamosa, nigricans, olivaceozonata, ad 

 umbones rufa, pars anterior magna, rotundata, infra paullo 

 declivis, postice fere duplo longior, rostro brevi, apice 

 rotundato, inframediano, margo superior rectus, ascendens 

 posterior concaviuscukis, ventralis totus regulariter arcua- 

 tus; area parva, lunella Hgament, maxima. Long. 80, alt. 

 47, cr. 26 mm. — A. inornata Morch pr. p. 



Hah. Dania in Fyen (in fossa argillacea in Hofmansgave: 

 0. Morch). 



A. incrassata Shepp. (Lin. Trans. 1820). C. elongato-subtrian- 

 gularis, ventricosa, solida, fuscobrunnea, rugosa, antice 



