348 



BULLETIN OF THE BUREAU OF FISHERIES. 



Genus EUDENDRIUM. 



This is the only genus of the family Eudendrid». 



Key to the Species of Eudendrium Found in the Beaufort Region. 



A. Main stem simple, colony minute. 



a. Hydranths which bear gonophores showing little or no abortion E. album. 



b. Hydranths which bear gonophores much aborted E. capillare. 



B. Main stem fascicled, colony large. 



a. Hydranths which bear gonophores with little or no abortion E. ramosum. 



b. Hydranths which bear gonophores much aborted E. carneum. 



Eudendrium album Nutting. 



Eudendrium album Nutting, Ann. and 

 Mat'. Nat. Hist., 1898. p. 362. Nutting, 

 Hydroids of the Woods Hole Region, 

 1901, p. 334. Hargitt, Biol. Bull . 

 1908. p. 97. 



Trophosome. — Colony minute, sel- 

 dom more than one-quarter of an inch 

 in height; stem un branched or witli a 

 few straggling branches, very slender. 

 Annulations may be present, but not 

 in any very definite arrangement. 



Gonosome. — Gonophores borne on 

 the hydranth body immediately be- 

 low the tentacles. The hydranth may 

 be smaller and the tentacles may be re- 

 duced in number, but the abortion is 

 never complete. Male gonophores two 

 or three chambered, few on a hy- 

 dranth; female gonophores similar to 

 the type for the genus, but small and 

 few in number. 



Color. — Hydranths and female 

 gonophores white, male gonophores 

 pale yellow, hydrocaulus nearly trans- 

 parent. 



Distribution. — On shells, Bogue 

 Sound, 10 feet; on sponge. North 

 River, 6 to 10 feet; on piles at Mar- 

 shallberg, near low water. 

 Eudendrium capillare Alder. 



Eudeit-driutn capillare Alder, Cat. Zooph. Northumberland and Durham. 1857, p. 15. Nutting, Hydroids of Woods Hole 

 Region, 1901, p. 334. 



Trophosome. — Colony small, not more than one-half inch in height, usually branched; annulations 

 at the base of the branches and pedicels. 



Gonosome. — Female gonophores borne on aborted hydranths which may spring from a branch or 

 directly from a hydrorhiza. They form a very noticeable cluster. Male gonophores with an arrangement 

 similar to the female gonophores, and like them found on pedicels arising from a branch or the hydrorhiza. 

 They are two or three chambered. 



Color. — Hydranths and male gonophores light green, female gonophores reddish orange. 



Distribution. — On shells in Bogue Sound, 10 feet. 



Only a few specimens of this species were obtained and among them there were no male colonies. 

 On that account I have copied Allman's figiu-es and made use of his description. 



Fig 



-Eudctidriutn album Nutting. A, male colony with gonophores; 

 hydranth with female gonophores. 



