456 The American Naturalist. - oo 
March 10.—Mr. L. P. Gratacap exhibited pieces of a drift bowlder 
containing fossils, and read the following paper : 
ADDITIONS TO THE DRIFT FOSSILS OF STATEN ISLAND, 
' These specimens represent the remainder of one of the bowlders 
found by Mr. Arthur Hollick, at Prince’s Bay, last autumn, mentioned 
in our Proceedings for Nov. 11, 1893. 
The rock is a lower Helderberg limestone, somewhat crystalline and 
shaly, and affords numerous fossils, conspicuous among which is Stro- 
pheodonta varistriata var. arata Hall, a fossil brachiopod characterized 
by a very convex ventral valve and by prominent ribs, which are 
scored by numerous delicate striae, easily discernible under a low mag- 
nifying power. This fossil assumes some importance, in its numerical 
representation, in the lower Helderberg beds of Becraft’s Mountain, 
east of the Hudson River, in Columbia Co., and the most easterly 
exposure of the Helderberg series of strata in New York State. It 
seems safe, from this fact, and a close lithological similarity in the 
material of the bowlders with the Becraft stone, to conclude that this 
“wanderer” commenced its travels southward from that distant point. 
Associated with it are a few lamellibranchs, which are seen less com- 
monly in our drift material, and were actually less important elements 
in the Helderberg Sea. These are Pterinea communis Hall, Pterinopee- 
ten bellula Hall, and Aviculopecten umbonata Hall, all new to the 
Island. Upon one of these Pterina communis there is the half effaced 
trace of a pygidium or tail of Lichas digsbyi Hall, a trilobite and one 
common species, usually found in separated heads and tails. Its iden- 
tification as Lichas is unquestionable, but in the complete absence of 
any considerable evidence, from the poor nature of the specimen, It 18 
not certainly separated from L. pustulosus. If bigsbyi, as is probable, 
it also indicates Becraft’s Mountain as its origin. Amongst the brachio- 
podous remains in these fragments we find Rensselæria mutabilis Hall, 
Meristella bella Hall, and Orthis eminens Hall, all new in our Island 
finds. Besides these molluscs there are seen, in these fossil remains 
plain and broad sheets, or fronds, of the bryozoan Lichenalia, showing 
both the poriferous and non-poriferous surfaces. The species I J 
unable at once to determine. Besides this there is a fenestrated poly- 
zoan, Fenestella œsyle Hall, as far as I can fix on its specific nature. 
The heteropod Platyceras gebhardii Hall is another new species 
although this reference may be doubtful, as in this genus of shells ee 
Species run insensibly into each other and the present multiplication g 
these specific names seems provisional. 
