254 KANSAS UNIVERSITY SCIENCE BULLETIN. 



coracoid, and its discovery in the "grunlich grauen eocenen 

 Glaukenitsande" is remarkable. It apparently does not have the 

 characteristic coracoid foramen. Further information concern- 

 ing this Tertiary animal will be looked forward to with interest. 

 In conclusion, I desire to correct an error made by myself. 

 That which I considered the nuchal fringe in the mosasaurs is 

 evidently only the slender cartilaginous rings of the trachea, 

 first described and figured by Professor Osborn. I have no ex- 

 cuse to make for the mistake, which I recognized when too late 

 to correct. 



Explanation of Plates XII and XIII. 



Plate XII. Upper figure — Part of hind paddle of Platecarpus coryphceus 

 Cope, in matrix one; natural size. Lower figure — Part of front paddle of 

 Clidastes stenops Cope. 



Plate XIII. Ischium and part of hind paddle of Platecarpus sp., from 

 Milton, N. Dak. 



