65 



which did not appear to him to be, at that time, capable of satisfac- 

 tory elucidation. He characterized it as the type of a new genus. 



Hyalonema. 



CoralUum simplex, subcylindricum, ad basin attenuatum et in 

 Spongid immersum, supra basin cortice coriaceo tuberculato 

 tectum ; tuberculis sparsis, depressis, polypiferis. j4xis e spi- 

 culis numerosis, elongatis, filiformibus, subcontortis, siliceis 

 constans. 



Polypus ignotus. 



Hyalonema Sieboldi. 



Hab. apud Japoniam, Dr. Siehold. 



Specimens are contained in the British Museum, to which they 

 were presented by John Reeves, Esq. ; in the Museum at Leyden ; 

 and in the collection of Mr. Gray ; the latter having been purchased 

 from the Dutch Museum, through the kindness of Dr. De Haen. 

 A few fibres of the axis formed part of the Sloanean Collection, 

 when it was originally acquired for the British Museum, but their 

 nature was altogether unknown. 



