22 THE INVERTEBRATE FAUNA 



have often found it under stones and in 

 rock pools while shore-collecting. It is 

 with us nearly confined to the littoral 

 and upper laminarian zones. 



Ophiocnida ballii (Thompson). 



Off Anstruther (J. #.). 

 In his "History of British Starfishes," 

 Forbes mentions two species of Ophiocoma, 

 viz., Ophiocoma Ballii of Thompson, from 

 the coast of Dublin, and a new species, 

 0. G-oodsiri, from the Forth. From a 

 comparison of type specimens of these, Mr 

 Norman has determined that 0. Ballii and 

 0. Goodsiri belong to the same species, 

 and of the two specific names, that of 

 Ballii has the priority. 

 Amphiura ballii is found on the northern 

 and eastern coasts, and in the Irish Seas. 



0. Irachiata (Mont.). 



Firth of Forth (Howd.). 

 The Ophiocoma Irachiata of Forbes. We 

 , have never found it in the Forth, and 

 include it in our list on the authority of 

 Dr Howden. 0. Irachiata has elsewhere 

 been recorded from the western and Irish 

 coasts. 



Opliiothrix rosula (Linck). 



Leith (Ed. Mus.) ; Firth of Forth (M'R) ; 

 Firth of Forth, 22 fathoms (M. & #). 

 The Ophiocoma rosula of Forbes. This is 

 the most abundant of the Forth species of 

 Ophiuridse, occurring in great numbers on 

 the oyster and shell banks, and extending 

 into deep water. The pigmentation of 

 different individuals is very varied, but it 

 is always easily recognised by the generic 

 character of the two large triangular plates 

 on the dorsal surface opposite the origin 

 of each ray. 



