RESTORATIONS OF DEVONIAN CEPHALOPODS 463 
varying in width from 16™™ near the chamber of habitation to less than 5™™ near 
he apex. 
Surface and siphuncle unknown. 
One individual of medium size which is crushed laterally measures about 
22°™ in length and 15°™ in its greatest diameter, the actual diameter of the circle 
being about 10.5°™. 
This species most resembles Gom phoceras mitra Hall from the Upper 
Helderberg Limestone of Lexington, Ind.,* but differs from it in essen- 
Fic. 4.—Exterior view of Fic. 5.—View of Gompho- 
the concave portion of a well-. ceras calvini N. S., showing 
preserved specimen of Gom- the unsymmetrical shape of the 
phoceras calvini. upper portion due to the lean- 
ing to one side of the chamber 
of habitation. 
tial points. A more careful study of certain species of Gomphocer- 
ases from New York, Indiana, and Ohio will show a close relation to 
G. wisconsinense. 
Specimens of this cephalopod occur rarely in the Milwaukee 
Cement Quarry. They are called “horses’ hoofs” by the quarry- 
men because of a fancied resemblance to a hoof. The many shapes 
t Paleontology of New York, Vol. V, Part 2, p. 330, and Plate 119, Supplement 
Vol. V, Part 2. 
