466 WISCONSIN NATURAL HISTORY SURVEY 
Siphuncle in a crushed specimen 7™™ from the periphery on the concave side. 
Surface unknown. Internal mold frequently covered with parasitic bryozoa 
and worm (?) tracks. 
In none of the specimens which are referred to this species is the 
apex retained. This species resembles G. fischeri of the New York 
Marcellus, but differs from it in the arrangement of septa. It also 
resembles G. plena Hall.* 
The restoration of this species was difficult because of the poor 
meee 
Fic. 1o.—View of a crushed Fic. 11.—A crushed speci- 
specimen of Gomphoceras whit fieldt men of Gomphoceras fusiforme 
N.S., in which the entire 'ength of whitfieldi, showing the position of 
the chamber of habitation is pre- the sutures and the length of the 
served. chamber of habitation. 
preservation of the fossils. The apical angle and the rim of the 
aperture are somewhat in doubt, but are probably correctly shown. 
It is possible that the transverse section was broadly elliptical. 
Because of the unsymmetrical form the specimens are usually crushed 
in the same plane. 
Named in honor of Professor Samuel Calvin, State Geologist of 
Iowa. 
Locality.—Milwaukee Cement Quarry, Berthelet, Wis. They occur com- 
monly in the ‘“‘hard layer.” 
1 Paleontology of New York, 1888. Supplement to Vol. V, Part 2, Plate 121 A. 
