o'o^ - Prof. Allman on the Construction and 



Eudendridffi. 

 1. EuDENDRiUM, Ehrenberg (in part). 

 Trophosome. — Coenosarc consisting of a well-developed branch- 

 ing bydrocaulus, rooted by a creeping filiform hydrorhiza, the 

 whole invested by a chitinous periderm. Polypites developed 

 from the summits of the branches, vasiform or oval, with the 

 metastome contracted at its proximal and expanded at its distal 

 extremity so as to be more or less trumpet-shaped; tentacles 

 filiform, in a single verticil just behind the metastome. 



Gonosome. — Gonophores adelocodonic, developed from the 

 body of the polypite at the proximal side of the tentacles, or 

 from the hydrocaulus *; female sporosacs monothalamic ; male 

 sporosacs polythalamic. 



Eudendrium ramosum, Linn, (sp.), = Tuhularia ramosa, Linn., 

 = Small ramified tubular Coralline, Ellis, = Tuhularia trichoides, 

 'Pallas, = 1 Sertularia racemosa, Cayo\im,= Eudendrium ramosum, 

 Ehrenb. 



Eudendrium rameum, Pallas (sp.),= Tuhularia ramea, Pallas, = 

 Eudendrium rameum, Johnst. 



Eudendrium capillare, A\der, = Cort/mboffonium capillare, AUm. 



Eudendrium arbuscula, Wright. 



Eudendrium insigne, Hincks. 



Eudendrium humile, AUm. 



Eudendrium dispar, Agass. 



Eudendrium annulatum, Norman. 



Eudendrium cingulatum-\ , Stimpson. 



Eudendrium vaginatum, Allm. 



Eudendrium pusillum, Sars. 



2. Atractylis, Strethill Wright (in part). 



Trophosome. — Coenosarc consisting of a hydrocaulus in the 

 form of simple funnel-shaped stems, which are developed at 

 intervals from a creeping filiform hydrorhiza, the whole invested 

 by a chitinous periderm, Polypites emerging from the summits 

 of the hydrocaulus, into which they are retractile, fusiform, with 

 filiform tentacula placed in a single verticil round the base of a 

 conical metastome. 



Gonosome. — Gonophores adelocodonic, carried on the sides of 

 the hydrocaulus. 



* The polypite occasionally, from the exhaustion consequent on the 

 growth of the gonophores, becomes arrested, loses its tentacles, and is 

 converted into a false gonoblastidium. 



t Stimpson's short description of this species (Marine Invertebrata of 

 Grand Manan), unaccompanied as it is by a figure, is hardly sufficient few 

 a satisfactory diagnosis. 



