644 MEMOIRS OF THE CARNEGIE MUSEUM. 



EXPLANATION OF PLATE XXXV. 

 Shells of Diplodon imitator Ortmann, Diplodon simillimus Ortmann, and 



DiPLODON VICARIUS OrTMANN. 



All figures natural size. 



Figs. 1 and 2. Diplodon iiuitalor Ortmann, from Rio Vaccahy-mirim, Santa Maria, 

 Rio Grande do Sul, Brazil. Carn. Mus. Cat. No. 61.9248 (See also PI. XXXIV, figs. 5-7). 



Fig. 1. Adult female (No. 33), lateral view (same specimen as that figured on 



PI. XXXIV, fig. 7). 



Fig. 2. Young, gravid female (No. 21), lateral view. 



Figs. 3-6. Diplodon simillimus Ortmann, from Rio Nhundiaquara, Morretes, 

 Parana, Brazil. Carn. Mus. Cat. No. 6L9250. 



Fig. 3. Half-grown male (No. 11), lateral view. 



Fig. 4. Half-grown male (No. 16), lateral view. 



Fig. 5o. Adult, gravid female (No. 22), lateral view. 



Fig. 56. Adult, gravid female (No. 22), dorsal view. 



Fig. 5c. Adult, gravid female (No. 22), inner view of left valve. 



Fig. 5rf. Adult, gravid female (No. 22), inner view of right valve. 



Fig. 6a. Young, gravid female (No. 24), lateral view. 



Fig. 66. Young, gravid female (No. 24), dorsal view. 



Figs. 7 and 8. Diplodon vicarius Ortmann, from creek (Rio Ribeira drainage), 

 Aqua Quente, near Iporanga, Sao Paulo, Brazil. Carn. Mus. Cat. No. 6L9251 (See also 

 PI. XXXVI, figs. 1 and 2). 



Fig. 7. Half-grown male (No. 13), lateral view. 



Fig. 8. Adult female (No. 15), lateral view (See also PI. XXXVI, fig. 1). 



