DESCRIPTION OF CIMOLICHTHYS N. SP. 45 



would seem highly probable, therefore, that the horizon of the present species is 

 in the upper part of the 

 Upper Cretaceous. 



"The genus is character- 

 ized by the dentition, espe- 

 cially of the palatines and 

 dentaries. In the present 

 specimen the two rows of 

 teeth situated upon the den- 

 tary have a .great resem- 

 blance to those of the Amer- 

 ican species, especially C. 

 naepiolica. The inner row 

 of large teeth have the char- Figure l— Right Dentary of Cimolichthys n. sp. Natural size. 

 acteristic compressed form 



with anterior and posterior cutting edges placed somewhat obliquely. They are 

 unstriated. The base is much elevated and conical, and the five teeth preserved 

 are nearly all of the same size, with only slight discrepancies in the intervals be- 

 tween them. The outer teeth appear to be in a single row. They are small and 

 tube rculi form, about one millimeter in height, and with intervals between them 

 of about the same. The surface of the dentary has been mostly destroyed. 



Millimeters. 



" Space occupied by five inner teeth 55 



Height of middle tooth above bone 12 



Height of base 4 



Width of tooth where joined to base 4 



Space occupied by eight teeth of outer row 10 " 



AGE AND ANALYSIS OF PA RAH YB A LIMESTONE 



The chief point of interest in this small collection of fossils is that it 

 settles definitely the Cretaceous age of the leaden gray limestone at the 

 base of the hills about the city of Parahyba. 



A specimen of the rock containing the fossils was analyzed in dupli- 

 cate and found to be fairly good limestone. 



Analysis of the Cretaceous Limestone from Parahyba do Norte 



Per cent 



Silica (Si0 2 ) 7.32 



Iron (FeO) 1.26 



Lime (CaO) 45.82 



Magnesia (MgO) 3.95 



Carbon dioxide (C0 2 ) 41.48 



Sulphuric acid (S0 3 ) 0.44 



Total 100.27 



This rock was examined under the microscope in the expectation of 

 finding microscopic organic remains, but no fossils were found. 



