DuERDEN — On the Hydroida of the 8.W. Coast of Ireland. 139 



Order.— HYDEOIDA. 

 Sub-order I. — Athecata. 



Family I. — Ciavid^. 

 Clava multicornis, Forskal. 



This species was met with on many occasions growing on the 

 limbs of Stenorhynchus and other Crustaceans. In the majority of 

 cases the colonies are only young, and consequently the gonophores 

 are undeveloped, but the polypites are of the scattered type. It has 

 been obtained abundantly from Dursey Sound on the limbs of Inachus, 

 from Kenmare River, and from Berehaven. The species is generally 

 distributed on our coasts, and occurs more commonly growing on 

 stones and algae. 



Family II. — Htdeactiniid^. 



Sydractinia echinata, Fleming. 



Yery abundant from most localities, covering shells inhabited 

 by hermit crabs. From Berehaven, Long Island Sound, mouth of 

 Kenmare River, Crookhaven, Dursey Sound, thirteen miles south-west 

 of Galley Head at a depth of forty -three fathoms, and off Baltimore. 



Family III. — Podocoetnii)^. 



1. PodoGoryne carnea, Sars. 



This species was found encrusting a very large Buccinum wtdafum, 

 inhabited by Pagurus, from Long Island Bay. The smooth linear 

 spines of the encrustiug base easily distinguish it from the former 

 species in preserved specimens. It has not previously been recorded 

 from Ireland. 



2. Podocoryne areolata, Alder. 



This form is priucipally distinguished from the former by having 

 areolar spaces between the linear spines, which are arranged in 

 groups ; and by having the gonophores growing on the stolon instead 

 of on the body of %e polypite. It has been found coating shells of 

 Fusus, Turritella, Nassa, and Natica, inhabited by hermit crabs, from 

 off Dursey Head, Berehaven, and from Station I., forty miles off south- 

 west of Ireland. It is recorded from several British localities, but 

 not before from Ireland. 



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