5-1 COMMON SEAWEEDS. 



this plant the internal siphons are wholly concealed 

 by the external cells. 



Abundant in the Channel Islands, Devonshire, II- 

 fracombe, "Weymouth, and west coast of Ireland. 



Eytiphlgea Fettcticueosa. — Tin's is most abun- 

 dant in mid- tide pools, and prefers sand-covered rocks 

 and shallow water. It is very easily recognized by its 

 distinct pencil-like branchlets, set at regular distances 

 on the main stems, the tips of which retain a drop of 

 water on raising it from the pool. The Ceramidia are 

 very abundant on the branches all through the sum- 

 mer, and the tetraspores in distorted ramuli or short 

 branches. The tufts of this weed are often six inches 

 in diameter, and, when floating out in the pool, the 

 tips of the ramuli are yellowish and glutinous. Under 

 the microscope we see dark crimson stripes marking 

 the joints, yellowish transparent cells, and longitu- 

 dinal markings. The ceramidia are yellowish, with 

 crimson spores. 



Eytiphloea Compear ata. — This is considered a. 

 treasure, not for any particular beauty, but because it 

 is rare. Look for it on Corallina Officinalis. Small 

 fronds only two or three inches high ; branches with 

 acute axils ; the stems Jlat, and colour dark brownish- 

 red. It prefers the shallow sandy pool and full blaze 

 of the sun. 



BYTIPHEffiA PlNASTEOIDES, Or HOOKED ByTIPH- 



lcea. — This is a larger species, coarse, and frequently 

 encrusted with the lovely zoophyte Membranipora 



