396 



BULLETIN OF THE BUREAU OF FISHERIES. 



A comparison of the seasonal distribution of the Beaufort species which are found at 

 Woods Hole and at Naples is given below, the numbers referring to the number of species 

 and varieties common to Beaufort found in the other localities at the respective seasons : 



In this case many of the species recorded above for winter at Naples are found there 

 from autumn through spring, and some of the species recorded for summer at Woods 

 Hole are found there in spring and summer. In general, though, it will be seen that the 

 relationships of the Beaufort flora are greater with that occurring at Woods Hole in 

 summer and at Naples in winter. 



The relations between the occurrence of any single species and the temperature are, 

 however, frequently different in different localities. This is shown below where there is 

 given the seasonal distribution of five species at Beaufort, Naples, and Woods Hole, 

 with the range of the average temperature, in degrees centigrade, recorded in each 

 locality during the time of occurrence of each species: 



It will be observed that, while all of these species have the same seasonal distri- 

 bution at Woods Hole, they occur at different seasons at Beaufort and at Naples, and, 

 what is more important, they appear and disappear at different temperatures in each 

 of the three localities. Further studies are needed to explain these facts. 



Howe (1914) lists the following species found at and near Orient, N. Y., as having 

 been gathered in Long Island Sound during the month February 7 to March 7 : Ulva 

 lact-uca, Chatomorpha linum, Sargassum filipendula, Agardhiella tenera, Champia par-vula, 

 Polysiphonia nigrescens, Ceramium ruhrum, Dertnatolithon pustulatum. While further 

 search would probably -increase the number of perennial species listed for Beaufort, 

 there is no evidence that Champia or Polysiphonia persists there during the winter. 



VERTICAL. 



The vertical distribution of the algae at Beaufort is exceedingly limited, the total 

 range of all species growing in the harbor being only about 2.2 m., from the usual high- 

 tide line to about 1.4 m. below the usual lowest low tides. In fact, except at Shackle- 

 ford jetties and the outermost jetty at Fort Macon, where the water is clearer and the 

 algae extend deeper, the great majority of algae occur within a zone of 90 cm., from the 

 level of the usual lowest low tide to 90 cm. below this. A careful search was made on 



