282 C. D. SOAR ON THE GENUS HYDRACHNA. 



Edinburgh ; and Mr. Balfour Browne, Dr. George, and Mr. 

 Taverner for specimens from several districts in England. 



Explanation of Plate 21. 



1. Dorsal surface of Hydrachna globosa, to show the general 



form of the species of this genus. 



2. Epimera and genital area of H. globosa. $ . 



3. Palpus, showing also projection of capitulum, II. globosa. 



4. Eye capsule of H. globosa. 



5. Genital area of female H. globosa. 



6. Eye-plate of H. paludosa. 



7. „ ,, „ H. schneideri. 



8. ,, ,, ,, H. scutata. 



9. ,, ,, „ H. cruenta. 

 10. Eye-plates of H. distincta. 



Journ. Qaekett Microscopical Club, Ser. 2, Vol. Z., No. 63, November 1?08. 



