380 BULLETIN OF THE BUREAU OF FISHERIES. 



Of the 84 genera found in the Beaufort region, 24 genera and 46 species reach here 

 their northern known limit on our coast (Tables 5,7), while 4 genera and 9 species reach 

 their southern known limit in this region (Tables 6, 7). Furthermore, 20 species not 

 previously recorded for North America have been found, 1 1 of these being new. Of the 

 133 identified species and varieties, 78 (58.6 per cent) are* recorded for Europe, and 41 

 (30.8 per cent) for the Pacific coast of North America. 



The 46 species reaching their northern limit here (Table 5) have been found as 

 follows : 



Growing in Beaufort Harbor 16 



Growing only on coral reef 16 



Found only on Bogue Beach n 



Known only from other localities 3 



The 9 species reaching their southern limit here (Table 6) have been found as 

 follows : 



Growing in Beaufort Harbor 7 



Growing only on coral reef i 



Known only from other localities fc i 



The 20 species which are new to North America (Table 7) have been found as 

 follows : 



Growing in Beaufort Harbor ". 6 



Growing only on coral reefs 12 



Found only on Bogue Beach i 



Known only from other localities i 



The most striking characteristic of the flora is the preponderance of red and the 

 paucity of blue-green algae. The large number of red algae indicates the southern 

 relationship of the flora; but here also is found a large northern element, as was shown 

 above. The small number of blue-green algae is not easily explained. At other places 

 the number is probably greater than is indicated here; indeed, the author saw large 

 masses of undetermined Myxophyceae covering the rocks of a jetty near Georgetown, S. C. 

 At Ocracoke, N. C., also there were observed masses of blue-green algae densely covering 

 the ocean beach just beyond the high-tide line for many square meters and covering the 

 wharf piles between tide lines. The number of species found in these places was not 

 large, but other species may have been present. At Beaufort, N. C., however, although 

 one species (Lyngbya confervoides) is very abundant, covering walls and jetties for 

 considerable areas between tide lines, repeated careful searches have failed to discover 

 any other species in abundance and have yielded a total of only five species growing in 

 the harbor. 



The relative richness, in other respects, of the Beaufort flora as compared with the 

 flora of other localities is shown by the fact that of the 142 species and varieties recorded 

 for the region 132 were found at this place. While a part of this numerical preponder- 

 ance is undoubtedly due to the fact that Beaufort has been studied more thoroughly 

 than other localities, a large part is due to an actually greater richness of the flora of 

 this region. At no other locality has the author found anything to approach the number 

 of individuals or of species that may be observed at Beaufort on a single collecting trip 

 at any time during the summer. 



