646 MEMOIRS OF THE CARNEGIE MUSEUM. 



EXPLANATION OF PLATE XXXVI. 



Shells of Diplodon vicarius Ortmann, Diplodon decipiens Ortmann, and 



DiPLODON HILD.E OrTMANN. 



All figures natural size. 



Figs. 1 and 2. Diplodon vicarius Ortmann, horn creek (Rio Ribeira drainage), 

 Aqua Quente, near Iporanga, Sao Paulo, Brazil. Cam. Mua. Cat. No. 61.9251 (See 

 also PI. XXXV, figs. 7 and 8). 



Fig. la. Adult female (No. 15), dorsal view (same specimen as that figured on 



PI. XXXV, fig. 8). 



Fig. 16. Adult female (No. 15), inner view of left valve. 



Fig. Ic. Adult female (No. 15), inner view of right valve. 



Fig. 2. Half-grown, gravid female (No. 9), lateral view. 



Figs. 3-6. Diplodon decipiens Ortmann, from creek (tributary to Rio Iguassu), 

 Serrinha, Parana, Brazil._ Carn. Mus. Cat. No. 61.9253. 



Fig. 3o. Adult male (No. 4), lateral view. 



Fig. 36. Adult male (No. 4), inner view of left valve. 



Fig. 3c. Adult male (No. 4), inner view of right valve. 



Fig. Zd. Adult male (No. 4), dorsal view. 



Fig. 4. Adult female (No. 6), lateral view. 



Fig. 5. Half-grown, gravid female (No. 3), lateral view. 



Fig. 6«. Young female (No. c), lateral view. 



Fig. 66. Young female (No. c), dorsal view. 



Fig. 7. Diplodon hildce Ortmann, from Rio Jacuhy, Cachoeira, Rio Grande do 

 Sul, Brazil. Carn. Mus. Cat. No. 61.5864 (See also PI. XXXVII, figs. 1-3). 



Fig. 7a. Nearly full grown male (No. q), lateral view. 



Fig. 76. Nearly full grown male (No. q), dorsal view. 



