Explanation of Plate LT. 



Fig. 55. Leptiniis testaceus, lateral view. 

 55a. „ „ , dorsal view. 



56. fitenichnus collaris, lateral view. 



56o. „ „ , ventral view of apex of median lobe 



with sac slightly evaginated. 



566. Stenichnns collaris, ditto, lateral view. 



56c. „ ,, , lateral view with sac wholly evagin- 



ated, or nearly so. 



57. Evmicrus tarsatus, lateral view. 



58. Physa injlata, lateral view, with sac evaginated. 



Descriptions on pp. 506-510. Explanation of the letters used 

 uniformly on pp. 481-483. 



