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



(12) C. ohliqua, margine dorsali subrecte ascendente, 7vstrum breve, 

 inframedianum, obtusum, margo ventralis regulariter ciirvatus, 

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

 area modica, parva. 



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

 C. pariim obliqiia, ovato-rhombea, fere compressa vel 

 regulariter ventrosula, tenuis, rufescenti-viridis, radiata, 

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

 brevi, inframediano, obtuso, desuper attenuate, 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- 

 eiss. 0. Morch in Syn. Moll. Danise sua ut typum hujus 

 speciei figuram 281 superne ad dextrum in Iconographia 

 Rossmassleri citavit et quattuor formas hue pertinentes 

 retulit: 1. G. 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. Siiecia in Blekinge (in Herrstorpsjon ad Ronneby). 

 — Dania in Sjaelland, in multis lacubus. 



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

 obliqua, ovalis, ventricosa, prsecipue 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 concaviusculus, ventralis totus regulariter arcua- 

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

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



Hab. 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 



