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



283 



are more favorable to tUe growth of warm- water species than an^^ other 

 parts of Long Island Sound, and at those points we meet a vegetation 

 which we must go as far south as the Oarolinas to find normally. 

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

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

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

 Wood's Hole and Kew Bedford, again at Charleston Harbor and on the 

 coast of Korth 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 algse 

 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 Kereis was pub- 

 lished. This is in striking contrast 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 W^ood's Hole. 

 The actual number of species on 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 algae 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 Chrysymenia roseci^ described as growing in 

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

 shells, in company with Scinaia furcellata. 



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

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

 ber of species found on different parts of our coast : 





























05 





02 



® • 



5| 





o 



c 



c . 





5/' +2 



c3 ^ 





03 



o o 



o § 









„ ^ 





2 '-' 



S ^ 





o 



3 



= ^ 



?^^ 



s 

















.Q 





r^ 



!-^ 



•iM^ 



^ 



Q 



o 



Melaiiosperiiieoe 



72 



150 



85 



56 

 63 

 30 



28 

 72 

 35 



13 

 91 

 47 



50 

 92 

 49 



4 



Rhodospermcai 



19 



ChlorospermetB 



9 







Total 



307 



149 



135 



151 



191 



32 







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

 algse are common to Europe. This refers to our whole eastern coast. 

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



