25(3 PROF. ALLMAN ON NEW GENE B A 



Oonosome. Gronophores borne singly on short peduncles, which 

 spring from the body of the hydranth within the tentacles. 



Habitat. On Sargassum bacciferum. 



Locality. Gulf-stream, collected by Mr. Hygom, Zool. Mus. Cop. 



Hitherto only one species of the genus Cladocoryne has been 

 described. This {G. floccosd) was discovered by Mr. W. D. Eotch, 

 in Herra, one of the Channel Islands ; but no trace of the gono- 

 some was present in any of his specimens, and it was therefore 

 impossible to draw up a complete character of either the species 

 or the genus. The specimens of the new species from the Copen- 

 hagen Museum supply in some degree the deficiencies in our 

 knowledge of this remarkable genus, though they still leave much 

 to be determined. It seems pretty certain that the gonophores 

 are phanerocodonic or medusiform ; but the state of the specimens 

 does not allow of an absolute determination of this point. 



Cladocoryne pelagiea is a smaller form than C. floccosa, from 

 which it also differs in the very distinctly annulated condition of 

 the lower part of its stem. It had attached itself to gulf-weed 

 obtained in lat. 57° N., long. 13° W., by the late Mr. Hygom, 

 who, as I am informed by Prof. Liitken, was " the captain of a 

 trading-vessel, and a zealous and intelligent collector." 



COB YMOBPRIBM. 



Amalth^a. 



Amalth^a islandica. Plate IX. figs. 5, 6. 



Trophosome. Hydrocaulus attaining a height of about Ij^o-incb, 

 swollen below, where it is provided with numerous rows of papil- 

 liform processes, which become longer as they approach the base, 

 and are ultimately replaced by long filaments, which form a dense 

 tow-like hydrorhizal plexus. Proximal tentacles about twenty 

 in number, and about y^g of an inch in length ; distal tentacles 

 rather long, very numerous, and forming a dense terminal brush. 



Oonosome. Gronophores oval, in about nine pendulous clusters, 

 each cluster consisting of numerous gonophores, which are borne 

 on short stalks from all sides of a rather long common peduncle ; 

 more mature gonophores with four short tentaculiform processes 

 on the summit. 



Locality. North Iceland, Zool. Mus. Cop. 



This is an interesting Hydroid, and, as far as can be determined 

 from the specimen, is an AmaltJicea nearly allied to Amalthcpa 



