374 



BULLETIN OF THE BUREAU OP FISHERIES. 

 Genus SERTULARIA. 



Trophosome. — Stem and branches divided into regular intemodes, each of h hich bears a pair of 

 opposite hydrothecae; operclum of two flaps. 



Ckinosome. — Gonangia oval or ovate. 



Key to the Species op Sertularia Found in the Beaufort Region. 



A. Colony with alternate branches. 

 ^jf'"\'^ Hydrothecse with free portions almost at right angles to adnate 



portions S. versluysi. 



i'<^ B. Colony unbranched. 



a. Hydrothecae adnate for two-thirds of their length. . .S. cornicina. 



b. Hydrothecae small, adnate for less than one-half their length, 



5. stookeyi. 



Sertularia cornicina (McCrady). 



Dynamena cornicina McCrady. Gymn. Charleston Harbor, 1858, p. 204. 

 Sertularia cornicina Nutting, Hydroids of Woods Hole, 1901, p. 359. Hargitt, American 

 Naturalist. 1901, p. 390. Nutting, American Hydroids, pt. n, 1904, p. 58. 



Fig. }&.— Sertularia cornicina (Mc- Trophosome. — Colony in the form of an erect stem, usually less than 



Crady). A. portion of colony; one-half an inch high, without branches; stem divided into regular 

 , gonosome. intemodes, each of which bears a pair of opposite hydrothecfe; hydro- 



thecae tubular, adnate in front for about two-thirds of their length and then turned rather abruptly 

 outwards; margin with two teeth and a two-parted operculum. 



Fig. 39. — Sertularia stookeyi Nut- 

 ting. A, portion of colony; B. 

 gonosome. 



Fig. 40. — Sertularia versluysi Nutting. A, portion of main stem; B. portion 

 of branch. 



Gonosome. — Gonangia borne on the stolon, oval with a distinct but rather short collar; regularly 

 annulated. 



Distribution. — On floating seaweed and gulfweed in Bogue Sound; in North River and the 

 Straits at a depth of about 10 feet; on sponge dredged by Fish Hawk. 



