ART. 17 SHELLS FROM BRAZIL AND URUGUAY — MARSHALL 7 



shaped t^roove in a plate extending from the base of the upper an- 

 terior tooth to the base of the upper posterior one. Color white, due 

 probably to the loss of the periostracum. 



The type (Cat. No. 368228, U.S.N.M.) consists of a single valve, 

 and measures : Length, 5.5 mm. ; height, 5.5 mm. ; diameter if both 

 valves were present would be about 2.75 mm. It comes from the 

 coast of Maldonado, Uruguay. Cat. No. 368229, U.S.N'.M., includes 

 five unmatched valves, paratypes. Cat. No. 368252, U.S.N.M., in- 

 cludes three unmatched valves from Cape Santa Maria, Department 

 of Kocha, Uruguay. Both localities are in the estuary of the Rio 

 de la Plata. All the specimens were presented by Dr. Florentino 

 Felippone. 



EXPLANATION OF PLATES 



1*I^TE 1 



Fig. 1. Dlplodon pilsWyi, new species. 



2. Mycetopoda feUpponei, new species. 



3. Diplodon pUabryi, new species. 



Plate 2 

 Figs. 1-3. Anodontites ma/nsfieldi, new species. 



Plate 3 



Fig. 1. Mycetopoda feUpponei, new species. 



2. Diplodon piUhryi, new species. 



3. Mycetopoda feUpponei, new species. 



Plate 4 



Figs. 1- 3. Diplodon jacksoni, new species. 



4- 6. Anodontites elfa, new species. 



7- 9. Corbula tirugiiayensts, new species (enlarged). 



10-12. Nueula feUpppnei, new species (enlarged). 



13-15. Nticula uruguayensis, new species (enlarged). 



o 



