made the type of a new genus, as proposed by Kiitzing, his spe- 

 cific name, Griffithsianum, may very deservedly be adopted. At 

 present I prefer leaving it in Asperococcus, from its very close 

 affinity both with A. echinatus and A. Turneri. 



It appears to be of not unfrequent occurrence in the Mediter- 

 ranean, several stations being recorded. I possess a fine specimen 

 from Catania, given me by M. Gussone ; and I have gathered 

 very large specimens at the Cape of Good Hope, much larger 

 than any others that I have seen. It is very rare along the 

 Atlantic coasts of France and Spain, as I am informed by M. 

 Lenormand, who has kindly sent me a specimen gathered at 

 Cherbourg ; and may probably occur in North Africa, but I have 

 not received any specimens from that coast. In the British Seas 

 it has as yet, only been found along the southern shores of Eng- 

 land, and in the Channel Islands ; but it is not improbable that 

 it may yet be discovered on the Irish coast, where so many 

 southern forms reach their northern limit. 



Fig. 1. Asperococcus compressus: — the natural size. 2. A transverse section 

 of the frond. 3. Portion of the same : more highly magnified 4. Portion 

 of the membrane, viewed vertically. 5. Vertical section of a sorus: — more 

 or less highly magnified. 



