176 BRITISH SEA- WEEDS. \llhodos2)erm€cc . 



it from otliers by the tufts of branchlets at the top of each 

 branch. By the aid of a lens the tetraspores at the base of 

 the branches appear divided hke a crosSy whence the specific 

 name. 



3. CaLLITH AMNION AIIBUSCULA^ Lijiighije. 



Hab. On rocks and stones in the sea. Perenniah Com- 

 mon in many phiccs. Rare on the east coast of Scotland, 

 though found by Drs. Greville and Arnott, and by the Rev. 

 Gilbert Laing. Not common on the west coast, though 

 found in some abundance at Ballantrae. It seldom makes a 

 good specimen for the herbarium, being in general too 

 closely matted and too dark in colour. 



When I had dismissed Miss Basya Arhuscula with 

 rather a frowning countenance, I was rebuked by looking 

 at Dillwyn's figure, PI. lxxxv. of ' British Confervse.' It is 

 lovely ; and I am glad to make the amende honorable. He 

 says, '^ Among the additions that have of late years been 

 made to the list of British Conferva, there is probably no 

 species more beautiful or interesting than the present, which 

 was discovered bv Mr. Brown in the north of Ireland so 

 long ago as 1800. The colour of this species when fresh 

 appears to be a deep red brown ; when dry it turns to a dull 

 brown, tinged with green, wholly devoid of gloss.'^ I must 



