Zoantharia. — Ryd/ro%oa. \ \ \ 



both come from the London Clay, which also yields Graphularia Corali. 

 JFetherelli, a representative of the Sea-Pens or Pennatulidse. Except GALLERY 

 for these, however, the British Cainozoic rocks are barren in ^ . 

 interesting fossils belonging to the Ccelentera. In the Brackles- ^^jj ^^^*" 

 ham Beds there occur some branching corals belonging to the genera cases 1-6, 

 Oculina and Diplohelia, and pebbles encrusted by Litharcea Wehsteri T*^^®- 

 (Fig. 167c); but with these exceptions the corals are small and 

 simple in the Eocene, and only five small species are known from 

 the English Pliocene. 



The foreign Anthozoa occupy Wall-cases 1 to 6. The series 

 begins in No. 6 with a fauna from the Ordovician rocks of ^^jj_ 

 America, such as Protarea, Alveolites, and Columnaria, and a group cases 1-6. 

 of fossils such as Constellaria, Frasopora, and Montieulipora, which 

 probably belong to the Bryozoa. 



In the succeeding Silurian period, the most interesting specimens 

 are those collected in the voyage of the "Alert " and "Discovery" in 

 Arctic America. The Devonian collection in Wall-cases 4 and 5 

 comprises mainly North American species ; but it includes some 4 & 6. 

 interesting species from Belgium and Germany, notably Calceola 

 sandalina (see Fig. 163), which, on account of its lid, or operculum, 

 was once regarded as a Brachiopod. The Carboniferous corals in 

 Wall-cases 3 and 4 include the types of those brought by Sir 344 *^*' 

 Roderick Murchison from the Ural Mountains. The Triassic 

 collection is small, but the specimens from the St. Cassian Beds 

 of the Tyrol are of interest. 



The Jurassic and Cretaceous collections in Wall-cases 2 and 3 Wall-cases 

 illustrate the faunas of Central P]urope. The Cainozoic series in ^ * ^• 

 Wall-cases 1 and 2 include representatives of the Indian faunas, ^ * leases 

 and many type-specimens of fossil corals from the West Indies. 



II. Hydrozoa. 

 Subclass 1. Acraspedote Hydrozoa. 



Order 1 . Tetrameralia | including the typical Jelly- 

 2. Octomeralia J fish and Sea-Blubbers. 



Subclass 2. Craspedote Hydrozoa. 



Order 1. TrachymedusoG : a group of Jelly-fish. 



2. Hydroidea: the fresh-water Polype and 



Hydroid Zoophytes. 



3. Siphonophora : the Portuguese Man-of-war 



and its allies. 



The Hydrozoa include all the Coelentera in which there is 

 no special oesophageal tube below the mouth (though in some 



