b INVERTEBRATE ANIMA.LS. 



Group 14. — Sub-class DISCOPHORA. SjVxoj, a disc; '^spoo, 

 I carry. Naked-eyed, or True Medusa. 



IT Coloured drawings of these very beautiful, but 

 small and little-known Jelly-fish. 



Group 15. — Sub-class LUCERNARIDA. Lncerna, a lamp. 

 Hidden-eyed Medusa. 



IT Drawings of the Hydra-tuba, and its develop- 

 ment; and of various AcALEPHiE, including 

 the common Jelly-fish of our shores, which 

 are in fact the free-swimming flowers, gono- 

 2)hores, of the little stationary Hydra-tuba. 



Sub-class HYDROCORALLIN^. Hydrozoa pro- 

 ducing a regular skeleton of carbonate of lime, 

 coral, often of large size. Not known to be 

 represented in deposits older than the Tertiary. 



Group 16.— Family MILLEPORIDiE. The animals are 

 supposed to be propagated by free-swimming Medusiform 

 Gonophores. 



% Specimens of the Coralla of various Millepores, 

 from the West Indies, where they are familiarly 

 known as " Sea-ginger." M. nodosa, from the 

 Pacific. 



Upper Compartment. 

 Drawings of the animal of MiUepora alcicornis, 

 after Louis Agassiz ; and of M. nodosa, after 

 Moseley. Note the larger central alimentary 

 zooids surrounded by the smaller and more 

 numerous prehensile zooids. 



Group 17.— Family STYLASTERID^. o-tDAov, a jnllar : 

 a(XTpr)v, a stae. These had always been regarded as 



