Dcsci'lptloHH of ASyycr/es. 21 



This important I'uraniinifer was first found by Roemer on the 

 u])j»c!r branch of the Pedernalis, associated with lylostoma peder- 

 n(di>;. I have found its true position to be in the medial por- 

 tion of the Glen Rose beds, where, as on the Colorado near the 

 mouth of Bull creek, it occurs in a massive chalk some ten feet 

 thick. The ^'Orhllollna " beds are among the most characteristic 

 and distinguishing features of the upper Neocomian of Europe, 

 in the region of Jura, and in Dauphine, Portugal, and Sitain. 

 Tlicir occurrence in a similar stratigraphic position in the Texas 

 region is additional evidence of the Neocomian age of the Glen 

 Rose beds. This Texas form has also l)een reported l>y Karsten 

 from the Neocomian Ijcds of Venezuela. 



ECHINODERMATA. 

 Epiaster (?) sp. indet. 



Oidy one echinoid lias come under the writer's observation 

 from the Glen Rose beds. It occurs aljout midway in the sec- 

 tion, near liull creek, Travis county, and in Somervell county, 

 Texas. This has l)een su1)mitted to Professor W. B. Clark, of 

 Johns Hopkins University, who writes as follows concerning it: 

 " 1 am inclined to think it not only a new species, but a new 

 genus." The specimens are left in Professor Clark's hands for 

 fu ture d eterm ination . 



Vermes. 



Serpula paluxiensis sp. nov. 



Plate I, Figs. 4, 4a, 4/a 



Cylindrical tubicolate, marked by concentric lines of growth ; 

 occurs in colonies, radiating out from a central nucleus. Indi- 

 viduals several inches long, but it is impossible to trace com- 

 l)lete length of si)ecimens, owing to mode of growth. Adult 

 specimens average one-eighth inch in diameter. 



This is one of the most abundant forms in the basement hori- 

 zon of the Glen Rose beds, and occurs attached to lignite, shells 

 of Oslreidx, and casts of other mollusks, or in immense colonies 

 or s])herical masses, some of which in Paluxy creek, averaging- 

 three feet in diameter, are composed entirely of this species. 



