EXPLANATION OF PLATE XIII. 
Limnaea cor, sp. nov. 
Fic. 1.—Type-specimen from marsh near Samara, Mesopotamia. 
Actual height 12 mm. 
2.—Young shell from the same locality. Actual height 6 mm. 
Limnaea tenera euphratica, Mousson. 
Fic. 3,34.—Shell of the phase angustior, Mousson, from a marsh 
near Samara. Actual height 10°5 mm. 
4.—Shell of the forma typica of the race from the same locality. 
Actual height 10°5 mm. 
5.—Young shell from the same locality. Actual height 
6°5 mm. 
