127 



Garveia Wright (= Corythamnion Allm.). Hydrophyton in- 

 vested with a conspicuous perisarc and coiisisting ofbranched hydro- 

 caulus, rooted by a filiform hydrorhiza. Hydranths fusiform with 

 filiforin tentacles, wliich are disposed in a single verticil round the 

 base of a conical hypostome. Sporosacs developed from the hydro- 

 phyton, where they are borne each at the summit of a short ramuhis. 



G. nutans Wright. (= Eudendrium bacciferum Allm.). 



Bimeria Wright (= Manicella Ahm.) Hydrophyton invested 

 with a conspicuous perisarc and consisting of a branched hj^dro- 

 caulus, rooted by a filiform hydrorhiza Hydranths fusiform with a 

 conical hypostome and a Single circlet of fdiform tentacles ; perisarc 

 continued over the body and hypostome of the hydranth to within 

 a short distance of the mouth, and forming a sheath on the proxi- 

 mal portion of each tentacle. Sporosacs developod from the hydro- 

 phyton. 



B. vestita Wright (= Manicella fusca Allm.). 



Wrightia n. gen. (= Atractylis Wrght). Hydrophyton con- 

 sisting of a hydrocaulus in the form of simple fuunel-shaped stems, 

 developed at intervals from a creeping filiform hydrorhiza, the whole 

 invested with a conspicuous chitinous perisarc. Hydranths retrac- 

 tile, fusiform, with filiform tentacles in a single circlet surrounding 

 a conical hypostome. Sporosacs springing directly from the sidea 

 of the hydrocaulus. 



Wr. areuosa Aid. 



Hydranthea Hincks. Hydrophyton consisting of a rudimental 

 hydrocaulus and a creeping filiform hydrorhiza, the whole invested 

 by a chitinous perisarc. Hydranths fusiform, mouth surrounded by 

 a circlet of filiform tentacles. Sporosacs crowned by a ribbed cap 

 and developed from the hydrorhiza. 



H. margarica Hincks. 



Stylactis Allm. Hydrocaulus not developed. Hydrorhiza formed 

 by a network of anastomosing stolons invested with a chitinous 

 perisarc, but without a superficial layer of naked coenosarc. Hy- 

 dranths subclaviform or cylindrical, with the tentacles filiform and 

 arranged in a single circlet round the base of a conical hypostome. 

 Sporosacs borne on the hydranths at the proximal side of the tentacles. 



St. Sarsii Allm. (= Podocoryne carnea Sars), St. fucicola Sars, 

 St. inermis n. sp. Nizza. 



Heterocordyle Allm. Hydrophyton composed of a simple or 

 branching hydrocaulus rooted by a creeping filiform hydrorhiza, 

 the whole invested by a chitinous perisarc. Hydranths fusiform, 

 with a single circlet of filiform tentacles round the base of a coni- 

 cal hypostome. Sporosacs borne upon blastostyles. 



H, Conybearei Allm. 



