1895. | NEW YORK ACADEMY OF SCIENCES. 275 
sptnosus are not usually aggregated in such considerable masses 
on the layers as either B. patens or Clonograptus proximatus. 
Considering the considerable thickness of beds of black shale 
without admixture of other sediments through which, in the St. 
John Group, Dictyonema is distributed, it would appear that 
conditions favorable to the existence of this species continued 
in the Acadian region for a long time. This species was not 
here as in some parts of Europe a solitary Graptolite, but had 
these small Rhabdopores associated sparingly with it, so far as 
we have traced it, in all the measures in which it has been found, 
hence we may consider them a part of the Dictyonema Fauna. 
Furthermore it appears that the presence of this graptolite 
fauna was not incompatible with the presence of trilobites. 
Angelin, years ago, claimed that he had found a trilobite, Acero- 
corne ecorne, in the Dictyonema beds, but later palzeontolo- 
gists have thought that this could not have been the case, 
and have suggested that this species was really from layers with 
Spherophthalmus alatus below the true Dictyonema beds,* as 
will be seen by reference to the introductory part of this paper ; 
both may be right if there was a commingling of the Dicty- 
onema and the Peltura faunas in Sweden such as occurred in the 
St. John Basin. To sustain such a view however, a wider 
range would need to be given to the Dictyonema fauna in nor- 
thern Europe than has been popularly assigned to it. 
Among other organisms that have been assigned to the Dic- 
tyonema beds of Sweden, we notice an Obolella, O. Salterz, Hall.+ 
Examples of this genus and of Acrotheta have also been found 
in grey layers enclosed in the Dictyonema shales of St. John. 
Two other Brachiopods are characteristic of the Dictyonema 
shales in their normal condition (7. e. black bituminous shales) 
viz.: Obolus refulgens and Lingulella Nicholsoni (?) so that 
this graptolite (Dictyonema flabelliforme) had companions that 
were members of other classes of the Animal Kingdom. 
THE GEOLOGICAL SECTION OF THE EAST RIVER, 
AT SEVENTIETH STREET, NEW YORK. 
By J. F. Kemp. 
The completion of the new tunnei for the East River Gas 
Company from the foot of East 70th street, underneath Black- 
well’s Island to Ravenswood, has brought to light a number of 
* Angelin seems to intimate that it wasabove rather than below the Dictyonema bed. 
+Om skifern med Clonograptus tenellus. J.C. Moberg, p. 100. 
TRANSACTIONS N. Y. ACAD. ScI., Vol. XIV., Sig. 18, Aug. 23, 1895 
