PLATE XXXII. 



PAGE. 



Figs. 1-2. Orthoceras ( Eu-Orthoceras?) rectum Wortheu, var. Junius... 539 



2. A side view. 



1. A specimen with a smooth exterior, perhaps of this species. Hanover, Indiana. 



Fig. 3. Orthoceras ( spyroceras ?) Jamesi Hall and Whitfield 546 



Side view, Todd's Fork, Ohio. 



Fig. 4. Orthoceras ( Eu-Orthoceras ) ignotum Foerste 539 



A vertical section through the siphon, with a transverse section indicating the po- 

 sition of the same. Hanover, Indiana. 



Fig. 5. Orthoceras (Eu-Orthoceras) viRGUEATUMHall? 543 



A vertical section throuarh the siphon. Soldiers' Home, Dayton, Ohio. 



Fig. 6. Orthoceras (Eu-Orthoceras) Hanoverense Foerste 543 



The upper part of the figure, (Fig. 6a) represents a view of the cast of the interior 

 of the shell ; the lower part represents a vertical section of the same passing 

 through the siphon. 

 6b Represents a part of the other side of t^ig. 6a, where it has been weather-worn. 

 Hanover, Indiana. 



Fig. 7. Cyrtoceras (GeypToceras) SUBCompressum Beecher 535 



~a Is a side view of two fragments upon which this species is founded: the smaller, 

 the type ; the larger, a part of the living chamber, placed in the position it 

 was supposed to have once occupied ; the character of the remainder of the 

 coil was conjecturally indicated. The diameter of t e whole is reduced to one- 

 fourth. Recent observations have led us to believe that the rate of expansion 

 of thr shell is much more abrupt, and that the appearance of the coil might be 

 more intermediate between that of Crytoceras and Gyroceras ; fig. lb, a vertical 

 section through the type showing the character of the siphon ; fig. 1c, a trans- 

 verse section of the living chamber near the last septum reduced to one-half 

 the diameter ; fig Id, showing the character of the surface markings of the type 

 , at d, in fig. la, but representing the same far more distinctly than warranted 

 by the actual state of preservation. B O. 

 Fig. S. CORNULITES SERPIXARIUS var. ClJNTONI, Hall. 



Collinsville, Alabama. 



