PLATE XXXVI. 
Oethoceras pravum. 
Page 255. 
See Plates 35, 81, 112. 
Fig. 1. A septate fragment, preserving nearly its normal form. The transverse striae and areolar markings 
and striations on the septa are not represented. 
Orthoceras stylus. 
Page 253. 
See Plate 79. 
A small individual, preserving thirteen chambers and a portion of the grand chamber. A longitu¬ 
dinal section of this specimen is shown in fig. 1, pi. 79. 
A larger individual, showing the great length and cylindrical form of the chamber of habitation. 
» Orthoceras Ohioense. 
Page 236. 
See Plate 35 A. 
Fig. 4. Lateral view of an individual, retaining the chamber of habitation and twenty adjacent chambers, 
showing the slight curvature of the tube, which is apparently a normal feature. Upper Hel- 
derberg, Delaware, 0. 
Cyrtoceras eugenium. 
Page 369. 
See Plates 47, 96, 97. 
Fig. 5. The inner side of a portion of the shell imbedded in limestone, showing little or no curvature, with 
the lamellse extending on either side. A remarkably large individual of the species. This speci¬ 
men is the original of Orthoceras foliatum. Schoharie grit, Schoharie, N T. 
Fig. 2. 
Fig. 3. 
