650 MEMOIRS OF THE CARNEGIE MUSEUM. 



EXPLANATION OF PLATE XXXVIIL 



Shells op Diplodon berths Ortmann and Diplodon enno Ortmann. 



All figures natural size. 



Figs. 1-4. Diplodon hcrlhw Ortmann, from Rio Jacuhy, Cachoeira, Rio Grande 

 do Sul, Brazil. Carn. Mus. Cat. No. 61.5865. 



Fig. la. Adult male (No. 24), lateral view. 



Fig. 16. Adult male (No. 24), dorsal view. 



Fig. Ic. Adult male (No. 24), inner view of left valve. 



Fig. Id. Adult male (No. 24), inner view of right valve. 



Fig. 2a. Young male (No. 3), lateral view. 



Fig. 26. Young male (No. 3), dorsal view. 



Fig. 3a. Gravid female (No. 10), lateral view. 



Fig. 36. Gravid female (No. 10), dorsal view. 



Fig. 4. Gravid female (No. 16), lateral view. 



Figs. 5-S. Diplodon cnno Ortmann, from Rio Grande (Sao Francisco drainage), 

 Boqueirao, Bahia, Brazil. Carn. Mus. Cat. No. 61.9264. 



Fig. 5. Half-grown male (No. 4), lateral view. 



Fig. 6a. Young male (No. 12), lateral view. 



Fig. 66. Young male (No. 12), dorsal view. 



Fig. 7. Adult female (No. 1), lateral view. 



Fig. 8a. Nearly adult female (No. 2), lateral view. 



Fig. 86. Nearly adult female (No. 2), dorsal view. 



Fig. 8c. Nearly adult female (No. 2), inner view of left valve. 



Fig. 8d. Nearly adult female (No. 2), inner view of right valve. 



