545 



Orthoc, 



middle and outer tubes were the last or living chamber ac- 

 cidentally pressed back over the inner tube. It would have 

 been an Endoceras if the small end had been solid and large 

 end chambered. Found at Fayetteville, O., in a fragment of 

 limestone made up of finely-broken organic remains, belong- 

 ing to the upper part of the Hudson River, HI 5. 



Orthoceras constrictum, Vanuxem. Geol. 3d. Dist. N. 



^.Jhl^y^-n.l^.U Hamilton, (Conrad. 



Ann. Rt. N. Y.1838.) 

 — I n Pennsylvania, 

 Monroe Co. Spec. 

 804-20, and Pike Co. 

 Spec. 808-19; both from Hamilton, VIII c, 



Orthoceras crebescens. Hall, 20th Regents' Rpt. N. Y. 



1^- 



^ A.>J-.-f^ -^ 





