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II. Subgenus: Sunetta Link (Cuneus Meg. v. 

 Mühlf.) V. Meroe L. 



B. Dentibus tribus in utraque valva. 



III. Subgenus: Tapes Meg. v. Mühlf.^ (Pullastra 

 Sow.) 



1) Familia: Textrix mihi. T. ovato oblonga^ utrin- 

 que rotundata; sinu paliiari mediocri, trapeziali vd 

 ovato; margine iuterno glaberrimo. V. textrix Chcmn. 

 (textile Gmel.) 



2) Familia: Parembola mihi. T. ovata^ antice 

 rotundata, postice angulata; sinu paliiari parvo^ tri- 

 angulari; margine inlerno glaberrimo. V. literata L. 



3) Familia: Amygdala mihi. T. oblongo-cordata, 

 antice rotundata^ postice angulata, sinu paliiari magno, 

 ovato; margine interno integro. V. decussata L. 



IV. Subgenus: Mercenaria Schum. V. mercena- 



ria L. 

 V. Subgenus: Gomphina Mörch. V. undulosa Lam. 



VI, Subgenus: Anaitis mihi. 



1) Familia: Clausina Brown. T. subcordata vel 

 trigono-cordata^ calcarea, sinu paliiari parvo, trian- 

 gulari. V. tiara Dillw. 



2) Familia: Chiona Meg. v. Mühlf. T. cordata, 

 sinu paliiari parvo, rotundato - trigona. V. plicata 

 Gmel. 



VII. Subgenus: Cyclina Desh. V. chinensis Chemn. 



VIII. Subgenus: Murcia mihi. 



1) Familia: Antigona Schum. T. cordata vel 

 rotundato - cordata ; lamellis vel sulcis transversis; 

 sinu paliiari mediocri, acute triangulari; margine in- 

 terne crenulato. V. puerpera L. 



2) Familia: Chamelea Klein. T. cordato-trigona, 

 liris transversis ; sinu paliiari minimo ; margine interno 

 crenulato. V. gallina L. 



