ALCYONELLA. 379 
Confervoid, tentacular disc orbicular. FREDERICELLA. 
tt Confervoid, jointed. PaLupICELLAID”. 
One genus only—PaLuDICcELLa. 
Genus XXXI. CRISTATELLA, Cuvier. 
1. CristarTeLLa mucEDo, Sir John G. Dalyell. 
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.’ 
