18 Hill — Pahomtolixj ij of flic Triniitj Division. 



fessors Ward and Fontaine, originally in the Potomac region,* 

 were long since referred by them to the Wealden, before they 

 were known to occnr in the magnificent Texas stratigraphic 

 series. 



The vertebrates have never })ecn s^'stematically stndied nor 

 collected, but the genera found all occur in the Lower Creta- 

 ceous of Europe. 



Of the invertebrates the ostracoid crustacean Cypridea of the 

 Glen Rose lower l»eds is. in Europe as in Texas, a prominent 

 feature of the Wealden (Lower Neocomian) beds. 



The foraminifer Patellina {OrhituJitcH) texdna Eoemer is indis- 

 tinguishable from the Orbitulites, which characterizes the U})per 

 Neocomian of France, and occvirs there under lithologic condi- 

 tions similar to those in Texas. 



Of the Pelecypod mollusca proper the J ?7-077i/r/ is indistinguish- 

 able from the Anomins of other ages. 



The only Ostrea (0. frnnJdini Coquand) seem identical with 

 the figures of a form which has been described under many spe- 

 cific names from the Upper Jurassic, and I^ower Cretaceous of 

 Europe. 



Peden stantoni belongs to a group of the Pedinidiv, which has 

 great specific development in the Neocomian of France, Spain, 

 and Portugal. 



Modiola, Leda, Cucidbva, Protocardia, Corhictda, PJioladnmya, 

 and the doubtful form called Isncardia have a wide range in the 

 geologic column, but the forms found in the Trinity Division 

 have a general varietal resemblance to those of the Neocomian. 



The only well-defined species of Trigonin (T. stoUcyi s}). nov.) 

 belongs to the scabrate forms peculiar to the Cretaceous and 

 later epochs. This is an important fact against the possible 

 Jurassic age of the beds. 



The aberrant genera, Reqiiienia and Mminjdei/ra, which al)ound 

 in the Glen Rose beds, are l)oth characteristic Lower Cretaceous 

 genera, occurring abundantly in Europe in the Neocomian beds 

 and not ranging higher than the Cenomanian. In describing 

 Requienia (Caprgtina') texana. Roomer asserted that it was hardly 

 distinguishable from the characteristic Caprotina lonsdallii of the 

 Neocomian of France. 



Of the Gastropoda, the genus Vycaria is represented by T . 

 hranneri resembling a peculiar species of the ll^uropean Neo- 



*See various papers ])y Profossors Lester F. Wanl and W. M. Fontaine 

 on the Potomac tlora of the North Atlantic coast. 



