Miscellaneous. 183 



for a clavicle, and a short oblique postero-intemal one, as though 

 adapted foi* a small sternum. There is a shallow notch on the inner 

 border anteriorly, corresponding to one of those of the Lacertilia. 

 This genus is more typically Rhynchocephalian than Cricotus. 

 Specific characters. — There is a shallow fossa in the entering angle 

 between the superior and inferior articular facets of the front of the 

 axis ; and the centrum of the same is obtusely keeled below. The 

 border of the anterior articular face of the dorsal vertebra with 

 keeled centrum is undulate. The obtuse inferior face of another 

 dorsal is rugulose, and the edge of the articular face is not undulate. 

 The inferior faces of two caudals are marked with two fine parallel 

 grooves, while in another caudal and the sacrals (?) the same is smooth. 

 There are some longitudinal ridges on the upperside of the larger 

 caudal. The coracoid is concave on its inferior side, convex on its 

 superior ; the inuer and anterior borders are thickened by flaring 

 of the edges. Surface smooth. The posterior edge is thin, and is 

 notched just behind the glenoid facet. The proximal facets of the 

 phalanges are shallow, simple, and more or less transverse. 



metre. 



Centrum of axis, length -006 



,, „ width at middle behind -008 



„ „ depth (oblique) -OlO 



Centrum of sharp-keeled dorsal, length -014 



,, ,, ,, depth behind .... -012 



width behind -012 



Centrum of rounded dorsal, length -012 



„ ,, depth behind -Oil 



„ „ width behind -OlOo 



Width of neural canal of rounded dorsal -OO-J: 



Centrum of larger caudal, length -014 



„ „ width -0085 



depth -008 



Length of base of neural arch of larger caudal .... '008 



Smaller caudal, length -0105 



„ depth of centrum '007 



„ width of centrum -007 



Width of rib-head -010 



Coracoid, length -024 



width -019 



Diameter of glenoid facet (transverse) '009 



Diameter of inner border (vertical) '006 



A phalange, length -010 



„ depth proximally -004 



„ width proximally "007 



This species was of smaller size than the Cricotus heteroclitus. 

 It is dedicated to John CoUett, of Newport, Indiana, of the State 

 Geological Survey. 



Ceratodus Vinslovii, Cope. 



Represented by a tooth in good preservation, lacking only a frag- 

 ment of one end and a portion of the inner margin of the base. 

 The crown of the tooth is in general outline an oval, wider at one 



