LIST OF THE SEA-WEEDS OR MARINE ALG.E, ETC. 



28^ 



i) 



are more favorable to the growth of warm-water species than any other 

 l);irts of Long Ishiiid Sound, and at those points we meet a vegetation 

 which we must go as far south as the Carolinas to lind normally, 

 Sargassum vuhjare, pre-eminently a southern species, abounds at Wood's 

 Hole and Greeuport ; at the latter place almost takes the place of Fucus. 

 Hypnea musciformis, a very common West Indian species, is found near 

 Wood's Hole and New Bedford, again at Charleston Harbor and ou the 

 coast of Xorth Carolina. This state of things seems to be owing to the 

 shallowness of the water in Vineyard Sound and Peconic Bay, and the 

 southern exposure of the shore, thus allowing the water of the smaller 

 bays to become quite warm, so that the spores of the southern a-lgai 

 might pass through the colder waters of Gay Head and Montauk with- 

 out germinating till they reached a more congenial home in Wood's 

 Hole and Peconic Bay. 



In examining the following list one cannot fail to notice the very small 

 number of species added to the flora since Harvey's Nereis was pub- 

 lished. This is in striking continst to the experience of the zoologists, 

 who seldom allowed a day of this summer to pass without additions to 

 the fauna. Of the species added, seven are common to Europe ; three 

 forms, found by Harvey, only at Key West, were found at Wood's Hole. 

 The actual number of species ou the eastern coast is, probably, not 

 greater than Harvey estimated, since recent additions are counterbal- 

 anced by the union of some of Harvey's species with older ones. No 

 facts were obtained as to the greatest depth at which alg;e will grow, as 

 the dredgings were carried on in comparatively shallow water, but the 

 depth at which several grow was found to be greater than Harvey had 

 supposed, as in the case of Chrysymcnia rosea., described as growing in 

 tide-pools, which I have only found in six or eight fathoms of water, on 

 shells, in comi)auy with Sciuaia furcellata. 



The following table has been prepared from Harvey's Nereis and 

 Agardh's Species Algarum, and represents, as far as is known, the num- 

 ber of species found on different parts of our coast : 



From this table it will be seen that over sixty-two per cent, of our 

 algt© are common to Europe. This refers to our whole eastern coast. 

 The table, however, does not show the fact that the nuaiber of common 



