404 Prof. E. Suess on Hyalonema in a Fossil State. 



Birds*, but which he believed to be equally applicable to the 

 class of Mammals. 



Table of the Distribution of Ruminants. 



LII. — On the Existence of Hyalonema in a Fossil State. 

 By Prof. E* Suess, of Vicuna. 



To the Editors of the Annals of Natural History. 



Gentlemen, 



A very interesting note on the " Glass-Rope Hyalonema" by 

 Dr. Gray, in your last Number induces me to give the following 

 supplement. 



■ A very common fossil of the Yorkshire Mountain Limestone, 

 described by M'Coy under the name " Serpula parallela," is, in 

 fact, a true "Glass-Rope." Specimens of this curious fossil 

 were first given to me by my excellent friend Mr. Edw. Wood, 

 of Richmond, in 1861 ; and I took a good number of specimens 

 with me to Vienna, because the siliceous nature of the fossil, in 

 a rock the other fossils of which are not changed into silex, 

 seemed to me to deserve some closer observation. I soon found 

 out the cause of this curious difference, and published a note on 

 the true relations o^ Serpula parallela in the * Verhandlungen ' of 

 the Vienna Zoological Society for 1862 (vol. xii. pp. 85 & 86). 

 I hope that English palaeontologists, after having read this note 

 and reexamined the fossil, will agree in naming it Hyalonema 

 parallelum. 



Yours most respectfully, 



Edward Suess, 

 Vienna, Oct. 13, 1866. University, Vienna. 



* Journ. Proc. Linn. Soc. ii. p. 130. 



