10 NEW YORK STATE MUSEUM 
Continued collecting in the Silurian rocks of western New York 
the Bertie waterlime and Lockport limestone, mainly by E. Reinhard, 
has furnished to the State Museum a large amount of striking fossils 
hitherto unknown. Most important among them are the graptolites, 
Dictyonema colonies over a foot in diameter, and varied types of 
the Inocaulis group. The latter with their fingerlike, thick-sheathed 
anchors and Medusalike crowns composed of a multitude of branch- 
ing tubes, belong to the most picturesque graptolites yet found any- 
where. Equally interesting are the cephalopods and among them a 
new genus closely related to Hexameroceras, in which the sides of 
the slit leading to the hyponomic sinus are provided with interlocking 
teeth, serving for protection as in the case of the narrow slitlike 
aperture of Cypraea and other gastropods. | 
An account of these fossils is in preparation. The remarkable 
graptolite fauna will be described in greater detail in a work on the 
graptolites of North America. The latter investigation is being 
undertaken by the writer because the graptolites belong undoubtedly 
to the best horizon-markers or guide-fossils over very large areas 
and their closer study will therefore be very helpful in the correla- 
tion of the rocks of New York State with those of other parts of 
the continent. ey 
Among the more striking new exhibits in the Museum is a case 
devoted to the display of a single species of fossil sponge from the 
remarkable Silurians of Black Cape, P. Q. A few of the upper 
strata of these rocks standing almost at right angles to the sea, 
expose these sponges in every grade of size from that of a chestnut 
to the size of a half bushel. They stand on the rock surfaces just 
as they grew in place on the sea bottom. Their preservation is fine 
and most suitable for intimate study. From a large number brought 
in by the State Geologist the present exhibit has been arranged by 
Winifred Goldring to show both their exterior and interior struc- 
tures. This sponge belongs or is closely allied to the genus Aulo- 
copium, and is termed provisionally Aulocopium hart- 
nageli, the specific name given in recognition of the fact that the 
first specimens were brought in by C. A. Hartnagel. 
FIELD OPERATIONS 
Iron region of Southeastern New York. In the studies pre- 
paratory to the ‘“ Mineral Resources of New York,” printed as a 
Museum Bulletin (No. 223-24) in 1921, it was found that too little 
was understood of the amounts and mode of accumulation of the 
