304 



ANALYTICAL INDEX. 



CHAPTER 11.— continued. 



Marginal cells successively generated, 

 Different stages of the hydrse, 

 Growth of inorganic depends on organic parts, 

 Plate XI. explained, 



page 38 

 ib. 

 39 

 ib. 



CHAPTER III. -Alcyonium, .... 



Its different form and aspect, 

 § 1. Alcyonium gelatinosum, 



It is the second tallest zoophyte in the Scotish seas, 

 Hydra, ..... 



§ 2. Alcyonium palmatum ? 

 Hydra with 12 tentacula, 

 Varieties of the Alcyonium, 

 Minute specimens, 

 Hydra? numberless, 

 With 12-18 tentacula. 

 Surface in cellular compartments, 

 Hydras cover the whole surface, 

 Their nature, 

 Perpetuation, 

 Granules seen in the flesh, 

 Ciliated gemmules, 

 They become stationary, 

 Their resemblance to shells, 

 Metamorphosis, 

 Hydra from the gemmule, 

 Brought to maturity in 12 days, 

 Spot diffuses in compartments, 

 Peculiarities of a specimen, 

 Its gemmules, 



Nature of the Alcyonium gdatxitotwm 

 Plates XII., XIII., XIV., XV., XVI., XVII. explained, 



40 

 41 

 ib. 

 42 

 ib. 



43 

 ib. 

 44 

 ib. 

 ib. 

 45 

 ib. 

 46 

 ib. 

 ib. 

 47 

 ib. 

 48 

 ib. 

 ib. 

 49 

 ib. 

 ib. 

 ib. 

 ib. 

 50 

 ib. 



'HAPTER IV. 



-Miscellaneous Zoophytes, 

 The shortest notices useful, 



52 



ib. 



§ ]. Hydra squamata, 



Approximates the Tubularia, 



Obtained by means of the Hermit Crab, 



ib. 

 53 

 ib. 



