58 TENTH ANNUAL REPORT. 
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Fic. 3. Cyrtoceras crescens. 
and width 334 inches. Air chambers 13, gradually deepen- 
ing, 3 or 4 more made up the series. 
Tube moderately enlarging and curving more rapid 
from apex to center. 
Siphon near ventral side. Nothing of shell-marking 
or any other part observable. Its general contour is of the 
form of an armsleeve. 
It is associated with Gyroceras cyclops, G. columbiense, 
Orthoceras dagon, Gomphoceras impar, Gomph. eximium, 
Gomph. plenum, ete., in the lower Corniferous limestone, 
U.. Held. jor) Columbus, @hio; 
