NEW ENGLAND HYDROIDS 47 



If the specimeus described bv Levinsen were bryozoan there must be an 

 instance here of a greater resemblance in the two groups than any yet 

 found. 



Sertularia stookeyi Nutting. 



The species of the genus Sertularia, as this genus is defined by Nutting, 

 in his monograph,! ■ are confined largely to the tropical seas. The outstand- 

 ing exception along the American shore of the Atlantic is Seriularia 

 2)umUa Linneeus, which is abundant along the New England Coast and the 

 Canadian coasts to the northward. Sertularia cornicina (McCrady) has 

 been found quite conunonly in the Woods Hole region but appears to be 

 more at home farther south. Hargitt has reported. Sertularia versluysi 

 Nutting,i8 but it was found on sargassum that may have come in from 

 far south. The stolon-like outgrowths that he mentions were common 

 enough on specimens foimd at Beaufort, and are probably seasonal as the 

 terminal outgrowths of Obelia eommissuralis and Campanularia angulata, 

 previously referred to in the note on C. angulata. 



Sertularia stool'eyi Nutting is a tropical or sub-tropical form and was 

 the commonest species of all the Sertularid^e in the material obtained at 

 Beaufort. Some specimens Avere obtained in Vineyard Sound outside of 

 Tarpaulin Cove at a depth of 7 or 8 fathoms. They were gro-n-ing on 

 fucus and on old stems of Thuiaria argentea, in company with colonies of 

 Sertularia cornicina. Thuiaria argentea is the common shallow water 

 Thuiaria of the New England coast and is not a Gulf weed form, conse- 

 quently it would appear that this species has become definitely located in 

 the region and is not a transient as Sertularia versluysi may have been. 

 It is the most delicate looking species in the North American waters but 

 it is possible that it has a greater degree of adaptability than some of the 

 more lusty species. 



1' American Hydroids. Part II, The Sertularids, 1904, p. 49. 

 "Biol. Bull., vol. XIV. no. 2, 1908, p. 112. 



