\ 



xvi THE MICROSCOPE. 



Via. PACK 



137. Cosman'Mm, conjugating ,,, 57 



138. Epitherrda gibba, conjugating ., 43 



139. Melosira nummuloides, conjugating 59 



140. Transverse section of common sponge 63 



141. Transverse section of common British sponge . . • • 68 



a. Spicules of the same more magnified. 



Calcareous spicules of Grdntia ciliata. 68 



142. Pin-like spiculura from Cliona, a boring sponge .. 69 



143. Spiculum from Spongilla, a fresh-water sponge . , 69 



144. Spiculum from unknown sponge 69 



145. Spiculum from Teihea 69 



146. Common Hydra 70 



a. Stinging organ from common Hydra 



147. A species of Sertularia, a zoophyte 71 



148. Campanularia Integra, a zoophyte 71 



149. " Cup" of Campanularia volubilis, a zoophyte. ... 71 



150. Spicula of Gorgonia verrucosa 71 



151. Transverse section from base of s^mQ oi Echiniis 



neglectus 72 



152. Calcareous rosette from sucker of Echinus 72 



153. Pedicellaria from Echinus 72 



154. Pedicellai-ia from star-fish 72 



PLATE VI. to face page 72. 



155. Lepralia, a polyzoon ••••• 72 



156. Bowerbanhia densa, a polyzoon 73 



157. Tobacco-pipe, or bird's-head processes of Notamia 73 



a. Bird's-heau process. 



158. Bugula avicularia 73 



159. 'Bird'^-hesid -process of Eugula Murrayana 73 



