Descriptions of Species. 39 



ARTIIROPODA. 

 Cypridea texana sp. nov. 



Plate I, Fig a, 3b. 

 f\ 



Shell microscopic ; elongate ovate globose, with angular ap- 

 pendage shown in fig. 1 ; opalescent or horny; cardinal margin 

 toothless, thickened centrally; opposite or ventral margin slightly 

 undulate; surface smooth, and not visibly punctate. 



It is difficult, says Zittcl, to classify with certainty even the 

 families of the Ostracoda, owing to the fact that the shell only is 

 preserved, which is not sufficiently differentiated to justify exact 

 diagnosis. The species here given occurs in abundance in the 

 Glen Rose beds, but usually only the merest outlines are pre- 

 served, or mere granules which suggest the form. In the mol- 

 luscan fauna at the plant bed of the Paluxy, near Glen Rose, 

 however, I was so fortunate as to secure a small fragment in 

 which the shell structure w r as well preserved. That the species 

 belongs to the Cypridas is strongly probable, resembling both the 

 genera Oypris and Cypridea. I have placed it in the latter pro- 

 visionally, because it is a marine form, occurring in masses of 

 marine shells or mollusca, while the former genus is a fresh 

 water one and of more recent occurrence. 



There are large masses of sub-oolitic material in the Mount 

 Bonnel beds, which are apparently largely composed of these 

 minute Crustacea. The Oypridse are also abundant in the Lower 

 Neocomian, or Wealden, of Europe. 



PLANTVE. 



Undetermined species. 



Plate I, Figs. l,a, 6, c, d. 



( u Goniolina?" of author's previous writings.) 



Spherical cone-like bodies, varying in size from three-quarters 

 to one and one-half inches in diameter; slightly elongate, oblate 

 or depressed at upper end, with well denned circular scar show- 

 ing attachment to receptacle; surface consists of minute imbri- 

 cate scales, usually worn down or indistinct ; scales elongate 

 ovate or sub-diamond-shaped, elongated toward upper end, and 

 crowded around receptacular scar ; seed minute. 



