ENGRAVINGS. 



PAGE 



LENS (Fig. 1) 15 



LENS (Fig. 2) 16 



THE YEAST PLANT. BUDDINGS OF THE YEAST PLANT. MUL- 

 TIPLIED CELLS FROM BUDS 23 



VENUS'S ELY-TRAP DION.EA MUSCIPULA 36 



SPONGES 50 



ACTION OF A LIVING SPONGE 53 



CILIA OF A POLYP 54 



SECTION OF THE BROWN HYDRAHYDRA FUSCA .... 56 



THE LONG-ARMED HYDRA 59 



THE GREEN HYDRA, OF THE NATURAL SIZE 61 



SERTULARIA LENDIGERA 65 



SERTULARIA ABIETINA 66 



SERTULARIA PLUMA . . . . . 67 



PLUMARIA FALCATA 69 



DYNAMENA OPERCULATA 70 



TUBULARIA INDIVISA 71 



CAMPANULARIA VOLUBILIS, WITH A SICKLE CORALLINE . . 72 



ANTENULARIA KAMOSA 74 



VESICLES OF THE SERTULARIA PRIMATA 75 



SERTULARIA TAMARISCA SERTULARIA POLYZOMA VESICLES 



OF THE ANTENULARIA EAMOSA 76 



THE SEA ANEMONE, OR ACTINIA 84 



SECTION OF ACTINIA 87 



ZOANTHUS 90 



FLAXEN ELUSTRA PLUSTRA CARBACEA 93 



POLYP OF ELUSTRA CARBACEA 94 



POLYP AND CELL OF VALKERIA IMBRICATA, (immature) . . 100 



