248 The American Geologist. -^p'"''- i^*^^ 
tion from it. Finally, in the paper cited above, the writer stated 
— "Under these circumstances, judgment is deferred as to the 
age of the conglomerate on Saint Helen's Island." 
After an examination of the fossils in the Peter Redpath 
Museum and of their mode of occurrence on the island, the 
evidence seemed conclusive that true Helderbergian rocks 
in situ do occur in this locality, and that some of the iden- 
tifications of Donald and Decks need rectification. Mr. E. 
Ardley of the Redpath Museum also showed the present writer 
a small slab broken from the siliceous limestone block in the 
agglomerate, which contains several well-preserved, long- 
winged Spirifers, like 5. pcnnatns. Other specimens of a Spiri- 
fer from the same rock were also shown, all of which proved 
that these fossils have nothing in common with the adjacent 
Helderbergian fauna, but belong to one of Middle Devonic age. 
The collections in the U. S. National Museum are too meager 
for detailed comparison, and in this article the writer cannot 
do more than correct some of the identifications of Donald and 
Decks, while pointing out the probable correlations of the Saint 
Helen's Island fossil faunas with those of New York. 
"Heliolitcs/' Decks. 
This seems to be based on a Striatopora. There is no 
Heliolitcs in the locality. 
"Orthis Jiippariony"^'," Donald and Decks. 
This identification is an error. The specimen pertains 
to the same form as the "Spirifer allied to 5^. arcnosus." 
Both these identifications are based on a Spirifer appar- 
ently near S. granulosus Conrad, and S. cnrytiencs Owen, 
of the Middle Devonic. The specimens are from the block 
in the agglomerate, and have no connection with Helder- 
bergian fossils. 
RhipidonicUa cfr. muscitlosa Hall? 
In the U. S. National Museum collection, there is a 
fragment of a large Orthis, or rather, RhipidomcUa, from 
the Helderbergian, which may be this species. 
RhipidomcUa cfr. mnscnlosa Hall? 
These specimens are usually smaller than those from 
New York, otherwise they are alike for both regions. 
"Strophomcna profunda Donald, Strophodonta profunda' 
Decks. 
