REPORT ON THE POLYZOA. 185 



Alcyonidiiim parasiticuvif Fleming. 

 Alcijonium parasiticum, Flem., Blainv. 



Menai Straits (Hincks). Liverpool Bay (Higgins). North 

 Wales (Shrubsole). 



Family II. — Flustrellid^. 

 Syn. Halcyonellea (part), Smitt. 



Genus Flustrella, Gray. 



Syn. Flustra (part) , Flem., Blainv., Johnst., Couch., Hincks, &c. 

 Alcyonidium (part), Smitt. 



Only one British species. 



Flustrella hispiday Fabricius. 



Flustra Tiispida, Fabr., Flem., &c. 

 Alcyonidium MspiduTn, Johnst., Smitt, &c. 

 Cycloum hispidu7n, W. Thomp. 



Common and widely distributed. 



Dredged in the summer by Mr. Thompson off Penmaen- 

 mawr. Colwyn Bay (Shrubsole) ; Hilbre, Isle of Man, &c. 



Family III. — Arachnidiid^. 



Syn. AlcyonidiadfB (part), Hincks, 1862 ; Alder. 



Genus Arachnidium, Hincks. 

 Syn. Arachnidia, Hincks, Alder. 

 This Genus contains three British forms. 



Arachnidium hippothooides, Hincks. 

 Arachnidia hipjyothooides, Hincks. 



On a Cyprlna, dredged off the Isle of Man (Hincks). 

 Only one other locality, Torbay, is known where this 

 form occurs. 



Group b. Stolonitcra, Ehlers. 

 Syn. Vesicular ina. Johnst. 



