2(34 



ANALYTICAL INDEX. 



CHAPTER lY .—continued. 



Peculiar vesicles, . . . . . imge 175 



Minute solen always present, . . . . 176 



Plate XXXIl. explained, . . . . . ib. 



§ 8. Sertdlaria (Plcmularia) falcata, ... ib. 



Species recently constituted genera, . . . . ib. 



Distinctions to be founded on important features, . . 177 



Trivial differences of no avail, . . . . . ib. 



Falcata stem, length compared with its diameter, . . ib. 



Regenerations white, . . . . . . ib. 



Hydra with 15 or 16 tentacula, . . . . 178 



Vesicles with white and yellow contents, . . . ib. 



Contain 1-7 planulae, ..... ib. 



Planulse are living animals, ..... 17.9 



Cilia inconspicuous from insufficient niaguifiers, . . ib. 



Five cells from metamorphosed planula, . . .180 



Planuke surviving 27 or 28 days, . . . . 181 



Analogies in generation of Sortularia) and Medusas, . . 182 



Tendency of planuloe to ascend, . . . • 183 



Disparities of young and adult Sertularia, . . . ib. 



Plates XXXIII., XXXIV., explained, . . 184 



§ y. Sertularia (Plumularia) pinnata, . . . . 185 



Hydra with 20 tentacula, ..... ib. 



Irregular shaped vesicles with a yellow corpuscuhim, . . ib. 



Plate XXXV. explained, . . . ■ ■ 18G 



§ 10. Sertdlaria (Plumdlaria) fascis, . . . . ib. 



Stem of aggregated tubuli, . . . • • 1^7 



Hydra with 25-27 tentacula, . . . . . ib. 



Generation by ascent and descent, .... ib. 



Tendency to vegetable growth, . . . • .189 



Vesicles, ....... ib. 



Plate XXXVI. explained, . . • • . ib. 



§ 11. Sertularia argentea, . . . . • ib- 



Knowledge of zoophytes slowly acquired, . . .190 



The tallest of Scotish zoophytes, .... ib. 



Specimen 27 inches high, . . . • .191 



Hydra with 20-22 tentacula, .... ib. 



Propagation, . . . . • • .192 



Compound vesicle, ...... ib. 



Multitude of planulge, ...••• 193 



