332 EUDENDRIUIVI RAMOSUM. 



1. EUDENDBIUM RAMOSUM, LlmmilS. 

 Plate XIII. 



CORALLINA TUBULARIA GRACILIS ET RAMOSA, AXILLIS RAMULORUM CONTORTIS. " Small ramified 



tubular Coralline." — Ellis, Corall., p. 31, pi. xvi, fig. a ; xvii, fig. a a. 

 TuBULARiA iiAMOsA, — Linn., Syst. Nat., edit. x. 

 TuBULARiA TRicHoiDES, — Pullas, Eleuclius, p. 84. 

 EuDENDRiuM RAMOSUM, — Ehreuberff, Corallentbiere, Abhandl. Berl. Akad., p. 29G. Johnston, 



Brit. Zooph., 2nd edit., p. 4G, pi. vi, figs. 1 — 3. 



Hincks, Brit. Hydr. Zooph., p. 82, pi. xiii. 



TROPHOSOME. — Hydrocaulus much branched, fascicled at its base, and attain- 

 ing a height of four inches or more ; primary ramification irregular, after which the 

 branches become regularly alternate and mostly distichous in their arrangement, 

 giving oiF all along their length, from their upper or distal sides, short, usually simple 

 ramuli, which support the hydranths on their summits ; peuisakc firm, annulated at 

 the origin of the branches, or even along the entire length of the smaller branches. 

 Hybkanths usually with about twenty tentacles, frequently atrophied in the male. 



GONOSOME. — Sporosacs, in the male, composed of two spherical receptacles, 

 and springing from the body of the hydranth in a verticil behind the tentacles, \yhich, 

 however, often become atrophied and disappear. Sporosacs in the female, piriform, 

 scattered, springing, some from the body of the hydranth at the proximal side of the 

 tentacles, and some from the hydrophyton just below the hydranth. 



Colour. — Hydraiitlis vermilion, perisarc dark reddish brown, in the older parts of the 

 colony often nearly black ; male gonophores with vermilion spadix modified to rose colour as 

 seen through the pale imperfectly transparent contents of the receptacles ; female gonophores 

 orange red. 



Develoj)me?it of (jotiosome. — April. 



Habitat. — Attached to oyster-shells, stones, &c., in the sea. 



Bathymetrical distribution. — Coralline zone. 



Localities. — On the Kentish shore, Ellis ; JMorecamb Bay, Lancashire, G. .T. A. ; south 

 coast of Devonshire, Rev. T. Hincks. 



The beautiful hydroid just defined may be conveniently assumed as the type of the genus 

 Eudendrium . There can be no doubt that it is identical with the " small ramified tubular coral- 

 line " of Ellis, and that it is, therefore, the original Tubularia raiiiosa, this being the binary 



