166 BRITISH SEA- WEEDS. \J\Ielano8perm€ce. 



dark brown spots, and, when on EnteromorpJiay forming a 

 ring round it. I was unacquainted with this till it was 

 pointed out to me by Dr. Greville in the island of Arran, 

 growing on Enteromorj^ha in a rock-pool. 



2. Myrionema punctiforme, Harvey, 



On Cliijloclaclia clavellosa at Appin ; on Ceramium nihenfi, 

 Mrs. Griffiths, Torquay. A beautiful microscopic object. 



3. Myrionema clavatum, Harvey, 



A thin purplish crust, covering the pebbles at half-tide 

 level, requiring the microscope to detect it. 



4. Myrionema Leclancherii, Harvey. 



The figures of this species and of M. punctiformey in 

 PL XLi. of Phyc. Brit., give a better idea of them than any 

 verbal description. 



Genus XXXI. ELACHISTEA, Buhy. 



Geu. Char. Parasites composed of simple, vertical, or radiating, 

 jointed filaments, issuing from beneath the surface-ceHules of 

 other Algoe : the lower part of the filaments hyaline, and com- 

 pacted together into a tubercle ; the upper half coloured (olive), 

 free. Spores oblong, mostly stalked, affixed to the tubercular 

 base. — The name seemingly from a Greek word, signifying the 

 least. — Harvey. 



