648 MEMOIRS OF THE CARNEGIE MUSEUM. 



EXPLANATION OF PLATE XXXVIL 

 Shells of Diplodon hild^ Ortmann and Diplodon mogymirim Ortmann. 



All figures natural size. 



Figs. 1-3. Diplodon hildce Ortmann, from Rio Jacuhy, Cachoeira, Rio Grande do 



Sul, Brazil. Carn. Mus. Cat. No. 61.5864 (See also PI. XXXVI, fig. 7). 



Fig. la. Young male (No. d), lateral view. 



Fig. 16. Young male (No. d), dorsal view. 



Fig. 2a. Adult female (No. 15), lateral view. 



Fig. 2b. Adult female (No. 15), dorsal view. 



Fig. 2c. Adult female (No. 15), inner view of left valve. 



Fig. 2d. Adu!t female (No. 15), inner view of right valve. 



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



Figs. 4-7. Diplodon mogymiriyn Ortmann, from creek (tributar,v to Rio Mogy 

 Guassu), Mogy Mirim, Sao Paulo, Brazil. Carn. Mus. Cat. No. 61.9260. 



Fig. 4a. Adult male (No. 22), lateral view. 



Fig. 46. Adult male (No. 22), inner view of left valve. 



Fig. 4c. Adult male (No. 22), inner view of right valve. 



Fig. 5a. Half-grown male (No. 9), lateral view. 



Fig. bh. Half-grown male (No. 9), dorsal view. 



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



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



Fig. 7a. Adult female (No. 38), lateral view. 



Fig. 76. Adult female (No. 38), dorsal view. 



