EXPLANATION OF THE PLATES. 



VOLUME I. 



PLATE I. INFUSORIES. 



Page 



FIG. 1. a. Enchelis Pupa \ 



b. Alimentary canal and stomach j 



2. Eosphora Naias 156 



3. a. b. c. d. Rotifera vulgaris 153 



4. Bacillaria multipunctata 350 



5. Cleopatra 350 



6. Discocephalus Rotator 349, ii. 97 



PLATE I. B. INFUSORIES. 



FIG. 1 . Vorticella cothurnata 350 



2. a. b. Zoobotryon pellucidum 351 



WORMS. 



3. Botryocephalus bicolor 327 



4. Diplozoon paradoxum 357 



a. Ditto, natural size. 



b. b. Mouths and oral suckers. 



c. c. Caudal plates and suckers. 



5. Diplostomum volvens 330 



6. Eye of a perch infested by Diplostoma. 



PLATE II. POLYPES. 



FIG. 1 . Madrepora muricata 1 80 



2. Sertularia volubilis 169 



a. a. Ovaries. 



