EUDENDRIUxM CAPILLARE. 335 



habit. The rigidity of the wliole hyih-ophyton is such that, on removal from tlie water, all the 

 branches, even to the finer twigs, retain their form and directions as completely as if the hydroid 

 were still immersed. 



The first description of the present species is that given by Pallas, whose specimens were 

 obtained from the Mediterranean. It is a frequent hydroid on the Scottish coast, wliere it is 

 often brought up upon the lines of the fishermen from deep water. 



Though I have many times seen specimens of this fine species, I have unfortunately not 

 had an opportunity of making a drawing from the living hydroid, which has, therefore, no place 

 among the plates of the present volume. The figures of Johnston, Dalyell, and Hincks, liowever, 

 referred to in the synonyms, will afford to the zoologist good aid in his determination of the 

 species. 



3. EUDENDRIUM CAPILLARE, Alder, Sp. 



Plate XIV, figs. 1—3. 



EuDENDRiUM c.iPiLLARE, — Aider, Catal., p. 15, pi. i, figs. 9 — 12. Hincks, Brit. Hydr. Zoopli,, 



p. 84, pi. xiv, fig. 2. 

 CoRVMBOGONiuM CAPILLARE, — Allman, in Ann. Nat. Hist, for August, 1861. 

 DicoRYNE CAi'iLLARis, — Aider, Suppl. Catal., p. 6. 



TROPHOSOME. — Eydrocaulus forming stnall bush-like growths, much and 

 irregularly branched, rising to a height of from one half to three quarters of an mch, 

 and given off at intervals from a creeping anastomosing stolon ; stems and branches 

 capillary, invested with a thin pekisarc, which is annulated at the origin of the 

 branches. Uydranths with about twenty-four or twenty-six tentacles. 



GONOSOME. — Male sporosacs two-chambered, supported in radiating, some- 

 what corjTubose clusters upon the bodies of hydranths from which the tentacles and 

 hypostouie have disappeared by atrophy, the stalks which carry them constituting 

 either uUimate ramuli of the hydrocaulus or simple stems, which spring du-ectly 

 from the hydrorhiza. Female sporosacs piriform, in clusters similar to those of 

 the male, and borne in the same way on the remains of atrophied hydranths whosf 

 supporting stalks are carried cither by the hydrocaulus or directly by the hydrorhiza. 



Colour. — Hydranths and male gonophores a pale greyish olive, female gonophores reddish 

 orange ; perisarc light brown, becoming darker in the older parts. 



Development of Gonosome. — June to September. 



Habitat. — On rocks near extreme low-water mark, and on other hydroids, old shells, and 

 the tunics of Ascidians. 



Bath y metrical distribution. — Laminarian and Coralline zones. 



