ART. 3 MOLLUSKS FROM URUGUAY AND BRAZIL MARSHALL 7 



of Colonia, Rio de la Plata, Uruguay, and was collected and presented 

 by Prof. Auguste Teisseire. 



This species belongs in the same group with 0. felipponei and 

 coloniensis. The clothlike periostracum and the more nasute form 

 and greater inflation serve to differentiate it from them. It is a 

 connecting link between C. coloniensis and G. fortis^ distinct from 

 both and yet partaking of the characteristics of each. 



EXPLANATION OF PLATE 



All figures multiplied by 1% diameters 



Figs, land 2. CorMcula, {Cyanocyclas) teisseirei, new species. 

 Sand 4. CorMcula {Cyanocyclas) simplex, new species. 

 Sand 6. CorMcula {Cyanocyclas) undulata, new species. 

 7 and 8. CorMcula (Cyanocyclas) platensis, new species. 

 9 and 10. Corbicula (Cyanocyclas) guahyhensis, new species. 

 11 and 12. CorMcula (Cyanocyclas) iheringi, new species. 



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