ANALYTICAL INDEX. 



303 



CHAPTER I.— continued. 



Corpuscula or gemmules seek the light, 

 Hydra from the gemtnule, 

 Five spines on the orifice of the cell, 

 Avicularium active for three weeks, 

 Properties of foliaceous zoophytes, 

 Plate VIII. explained, 



PAGE 24 



25 

 ib. 

 ib. 

 2G 

 ib. 



CHAPTER II. — Investing Ascidian Zoophytes, 



Different features for systematic arrangement, 

 Selection of characters difficult, 

 Subject must be well understood, 



§ 1. FlUSTRA niSPIDA, .... 



It is a brown fleshy substance, 



Named also Flustra carnosa, 



Five spines beset the cells, 



Hydra with 35 tentacula, 



Natural site a muddy shore, 



Perpetuation, .... 



Elliptical gemmule, .... 



First hydra generated from one end when stationary, 



Second hydra from the same gemmule, 



Tentacula of the young, 18-24, 



Twelve ligaments bind it to the cell, 



Polyparium of peculiar substance, . 



Plate IX. explained, 



§ 2. ALCYONIDIUM PARASITICUS!, 



Are animals separated by wide intervals? 



Kindred — how to be ascertained, 



Alcyonium and Alcyonidium distinguished, 



Alcyonidium — aspect and substance, 



Hydra 1 with 15 tentacula, 



Drop from the cells, .... 



Plate X. explained, .... 



§ 3. Alcyonidium mytili, .... 



Hydra with 15 tentacula, 

 Early polyparium transparent, 

 Perpetuation, .... 



Twofold multiplication, .... 



27 

 ib. 

 28 

 ib. 



ib. 

 23 

 ib. 

 ib. 

 ib. 

 30 

 31 

 ib. 

 32 

 ib. 

 ib. 

 ib. 

 ib. 

 33 



ib. 

 ib. 

 ib. 

 34 

 35 

 ib. 

 ib. 

 36 



ib. 

 ib. 

 37 

 ib. 

 ib. 



