268 



AN/VLYTICAL INDKX. 



ASCIDIAN ZOOPHYTES— continued. 



Produced along with generated parts, . . . page 244 



Object on Cellularia scruposa, .... 24.5 



Plates XLVL, XLYIII., ib. 



CLUSTEK OR SOCIAL ASCIDIAN ZOOPHYTES, ... 246 



Masses of cells at intervals, . . . . . ib. 



Hydra with 8 tentacula, ..... ib. 



§ 1. Valkeria imbricata, . . . . . . 247 



Dr Walker, ....... ib. 



Professor Jameson, . . . . . . ib. 



Numerous clusters on V. imbricata, .... 248 



Lowest cells and hydrae first mature, . . - . . ib. 



Plate L. explained, ...... ib. 



§ 2. Valkeria cuscuta, ...... 248 



Stem slender as a hair, ..... 249 



Hydra, ........ ib. 



Plate LI., ....... ib. 



§ -3. Valkeria lendigera, . . . . . . ib. 



Bears 50 or 60 groups of cells, .... 2.50 



Mode of increment, . . . * . . . ib. 



Plate LII., . . . . . . . 251 



§ 4. Valkeria spinosa; . . . . . . ib. 



Specimen resembles wet moss, .... 252 



Young produced in January, . . . . . ib. 



Bowerhankia or Lagenella, . . . . . ib. 



1. Bowerhankia repens, ...... 253 



Hydra with ten tentacula, ..... ib. 



2. Boicerhankia densa, . . . . . . ib. 



Hydra assumed as the type of ascidian form, . . . 254 



Hydra with ten tentacula, . . . . . ib. 



Ovum of B. repens, ...... ib. 



Professor Van Beneden's works of high quality, . . . ib. 



Ova B. densa, ...... ib. 



Gemmules or corpuscula, . . . . . ib. 



Metamorphosis, . . . . . . 255 



Connecting ligaments of hydra and cell, . . . . ib. 



Plate LIII. explained, ..... ib. 



END OF VOLUME I. 



