HYDROIDS OF BEAUFORT, NORTH CAROLINA. 375 



In some cases Hebella calcarata was found associated with tliis species, but not so commonly as has 

 been reported from other localities. 

 Sertularia stookeyi Nutting. 



Sertularia stookeyi Nutting. American Hydroids, pt. n. 1904, p. 59. 



Trophosome. — Colony an unbranched stem which may reach a height of one-half inch, very slender. 

 The proximal part of the stem is not divided into distinct intemodes, but the remainder is divided into 

 long, slender intemodes, each of which bears a pair of opposite hydrothecse. In conformity with the 

 slendeniess of the stem, the hydrothecse are smaller than are usually found in this genus. The two on 

 one intemode are adnate in front of the stem for not more than the proximal third of their length, after 

 which they gradually diverge, so that the distal third is free from the stem. In some colonies, probably 

 old ones, these portions were much prolonged. The margin has two teeth and a two-parted operculum. 



Gonosome. — Gonangia borne on the front of the stem, immediately below the proximal pair of 

 hydrothecae, oval with a distinct collar and operculum; no annulations on the surface; pedicel short and 

 curved. 



Distribution. — Common. Often accompanying 5. cornicina on floating seaweed and gulfweed; 

 dredged in Bogue Sound, North River and the Straits in 10 feet; on sponge dredged by the 

 Fish Hawk. 



Sertularia versluysi Nutting. 



Desmoscyphus gracilis Allman. Challenger Report. Hydroids. 1888. p. 71. 

 Sertularia versluysi Nutting, American Hydroids. pt. n, 1904. p. 53. 



Trophosome. — Colony branched, var>-ing much in height, but not reaching higher than 2 inches. 

 Sometimes the stem is divided into regular intemodes, with a branch and two hydrothecae on one side 

 and one hydrotheca on the other, but at other times the nodes are indistinct or absent. Branches are 

 given off alternately and regularly. The main stem may be straight, in which case the branching gives 

 it a regular appearance, or it may be more or less geniculate with the branches given off at the bends, 

 so that it seems almost dichotomous. Each branch has a transverse node followed by an oblique node 

 before the proximal hydrothecse are given off. As in the case of the stem, the nodes may be indistinct, 

 absent, or distinct and regular. The hydrotheca; are arranged altematel)- on the stem, but are strictly 

 opposite on the branches, the pairs being rather distant. The hydrotheca; are short and stout, the 

 proximal portion being ver>' turgid, those of the pair being adnate. The distal portions are bent so 

 abruptly as to produce a wrinkle on the concave side. The margin has two teeth and an operculum 

 of two flaps. 



Gonosome. — Unknown. 



Distribution. — On Sargassum collected on tlie seaward side of Bogue Bank. 



Genus THUIARIA. 



Trophosome. — Stem divided into irregular intemodes with more than one hydrotheca to each 

 intemode, or undivided; hydrothecae alternate; margin entire or with one or two teeth; operculum 

 with one abcauline flap or two flaps. 



Gonosome. — Gonangia oval or obovate, often supplied with spines on the shoulder. 



Thuiaria fabricii (Levinsen). 



Sertulariafastigiata Fabricius, Fauna Groenlandica, 1780, p. 45S. 



Sertularia fabricii Levinsen, Vid. Middel. Naturh. Foren., 1892, p. 48. 



Thuiaria fabricii Nutting. Hydroids of the Harriman Ex., 1901, p. 185. Nutting, American Hydroids. pt. u. 1904, p. 71, 



Trophosome. — Colony reaching a height of 2 inches; main stem straight, divided into irregular 

 intemodes, the distal ones each giving rise to one or more branches, which come oS on all sides to give 

 a bushy appearance ; branches divided dichotomously ; irregular intemodes give rise to a varying number 



