49 
the United States and described under the name of Fiico’kles caucla Galli, 
Vanuxem, for which, together with some other forms, Herr E. Kayscr has 
recently erected the genus Spirophyton. 
If, in reality, as I believe, this imprint belongs to the genus Spirophyton, 
it is interesting in that it would he the first that has up to the present been 
noticed in the Silurian. 
It will also form a new species, which I propose to call Spirophyton caiida 
Fhasiani, and which is distinguished from all the other species by the great 
number of fine striations on the surface of the laminas, which are arranged 
parallel to the strong curved, almost equidistant, ridges with which the surface 
is covered. 
Horizon and Locality. — The only specimen of this Spirophyton at 
present hnown was collected at Euntroon. 
