TAB. XII. 



Fig. 

 1. Achatina costellata. No. 25, p. 75. 



a. Back view of a cast. 



b. Side view of ditto. 



c Front view of a specimen with the shell partly preserved. 

 d. Back view of ditto. 

 c Front view of a cast. 



f. Ditto of ditto, shell partly preserved. Young shell. 

 <j. Back view of a cast of a young shell. 

 h. Front view of ditto. 

 *'. Back view, var. abbreviates 

 k. Front view, ditto. 



2. Limnaea caudata. No. 30, p. 83. 



a. Side view. 



b. Front view. 



c. Ditto, var. abbreviata. 



3. Limnaea longiscata. No. 32, jj. 85. 



a. Back view, intermediate state of growth. 



b. Front view, ditto. 



c. Front view, adult shell. 



d. Back view, ditto. 



e and g. Back views, var. distorta. 

 f and h. Front views, ditto. 



