EUDENDRIUM VAGINATUM. 339 



main stems fascicled, very thick, smaller branches extremely numerous, composed of a 

 single tube, which is closely and re2;ularly ringed throughout. Htdeanths with 

 sixteen to twenty tentacles. 



GONOSOME. — Female gonophores in spike-like clusters borne round the body 

 and stalk of atrophied hydrantlis. Male gonophores not yet observed. 



Habitat. — In rock pools and caves at low water. 

 Bathijmetrical dldriljiition. — Laniinarian zone. 

 Locality. — Burrafortli, Shetland, Rev. A. M. Norman. 



I have never met with this fine species. It was discovered by the Rev. Alfred IMerle Norman at 

 Burraforth, in North Unst, the most northern of the Shetland Islands, where it was found attached 

 to the perpendicular sides of a cavern about a foot beneath the water at the lowest spring tides, 

 as well as in some adjacent rock pools. Its dense shrubby habit, deeply annulated branches, 

 and the spike-like groups of gonophores on atrophied hydrantlis in the female colonies, form 

 a combination of characters which distinguish it from all other described species. 



The outermost portion of the fascicled stem appears to consist of a layer of remarkably 

 contorted tubes, which are figured by Mr. Norman, and referred to by him in his description of 

 the species. 



The male gonophores have not been observed. 



8. EuDENDEiuM VAGINATUM, Allman. 

 Plate XIV, figs. 7 and S. 



EuDENDRiuM VAGINATUM, — Allman, in Ann. Nat. Hist, for January, 18G3. Hincks, Brit. 



Hydr. Zooph., p. 86. 



TROPHOSOME.— Htdbocaultjs much and irregularly branched, rising to about 

 one inch and a quarter in height ; peuisarc rigid, deeply and regularly annulated 

 throughout. Htdkanths with about eighteen tentacles, and having the body as far 

 as the origin of the tentacles enveloped in a loose corrugated membranous sheath, 

 which loses itself below on the hydrocaulus. 



GONOSOME. — Not yet observed. 



Colour. — Hydrantlis vermilion, perisarc deep reddish brown. 

 Habitat. — In rock pools at extreme low-water spring tides. 



44 



