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EXPLANATION OF PLATE 23. 
Limnocalmius macrurus, Sars. 
Fig. 1. Side view of female from Eunerdale Water. 
2. Fifth leg of female. 
3. llfth leg of male. 
4. Outer branch of right fifth leg of male. 
5. Side view of female from the Caspian Sea IL. grimaldii). 
6. Side view of male from Lake Erie. 
7. Head of female from Insjcin, Sweden. 
8. Side view of last thoracic segment of male from Lake Jlalaren, Sweden. 
