4 INVERTEBRATE ANIMALS. 



Group 8— Remainder of Order FIBROSPONGI^ (Haeckel). 



U Series of British Marine Sponges ; specimens 



of fresh-water sponge, Spongilla, collected at 



Rainhill, and presented by Charles Longuet 



Higgins. 



upper Compartment. 



Specimens exhibiting many of the remarkable 

 varieties of form assumed by the Fibrous 

 Sponges. 

 Group 9.— Class INFUSORIA=:STOMATODE PROTO- 

 ZOA. 



The Glass thus restricted includes a small section onhj of the Infusoria 

 of the older authors. 



IT Coloured Drawings of Stentor, Vorticella, Noc- 

 tiluca, &c., chiefly from Ehrenberg's Die 

 Infusionsthierchen als Vollkommene Organis- 

 men. Leipzig, 1838. 



For the position of the Geegaeinidae see Appendix. 



Sub-kingdom CCELENTERATA. 



(Frey & Leuckart.) 

 xoiXo;, hollow ; hrspov, the howel. — Food-canal open to the 

 body-cavity. 

 Class HYDROZOA (Huxley). Internal cavity 

 simple. 



Sub-class HYDROIDA ; animals resembling the Hydra. 

 Group 10.— Order HYDRIDA-GYMNOCHROA (Hincks). 

 yujttvoj, naked; %po«, the skin. Estimated number of 

 species : British, 4. 



^\ Drawings of several species of Hydra, and of the 

 modes of its reproduction by buds and ova. 



