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GEOLOGY OF THE FOURTH DISTRICT. 
6. Acroculia erecta, n. s. — Erect; incurved at the beak, forming nearly two whorls ; ra¬ 
pidly expanding below. The surface is sometimes crossed by undulating lines. This is by 
no means a rare fossil, though sometimes less incurved at the apex. 
The form of the fossil is perfectly represented, though its more minute characters could not 
be, in consequence of the badness of the wood. 
Localities —Five miles east of Buffalo, Williamsville, Le Roy and other places. 
G9. 
Ichthyodorulite. 
The illustration above is the most perfect specimen of this kind of fossil seen in the district. 
The specimen is slightly arched, and carinated upon the back ; the surface is marked by 
parallel grooves and ridges, which extend nearly to the point; the latter is smooth, and finely 
finished. The specimen is hi inches in length. 
Locality —Freedon, Ontario county. 
There is a much larger specimen of a different species, in the cabinet of David Thomas of 
Aurora, which was obtained at the quarries near Waterloo. Mr. Skaats of Geneva informs 
me that he has seen a specimen from the Waterloo quarries, more than eight inches in length, 
and curved nearly into a semicircle. The surface was smooth, except an angular ridge along 
the centre. 
