ALCYONELLA. 379 



Corifervoid, tentacular disc orbicular. FREDERICELLA. 

 ft Confervoid, jointed. PALUDICELLAID.E. 

 One genus only PALUDICELLA. 



Genus XXXI. CRISTATELLA, 

 1. CRISTATELLA MUCEDO, Sir John G. Daly ell. 

 Hab. In the fresh- waters of Scotland, Sir J. G. Dalyell; 

 and those of Ireland, Prof. Allman. 



As I expect that I am going beyond my limited space, I 

 must not attempt to give a description, but refer the reader 

 to Sir John G. Dalyell, Dr. Johnston, and Professor Allman. 



Genus XXXII. ALCYONELLA, Lamarck. 



1. ALCYONELLA STAGNORUM. 



Hab. Stagnant waters, especially such as are tinctured 

 with iron in solution. Mr. Wigham, of Norwich, wrote to 

 me that he had found it in the dock at Ipswich, in salt- 

 water. May it not be a different species ? Pages of in- 

 teresting matter may be found on this in Dr. Johnston's 

 ' History of Zoophytes/ 



