180 APPENDIX E. PALEONTOLOGY. 



ribs four or five, longitudinal, irregular, rounded, nodulose; surface 

 marked with concentric imbricating lamellae; superior valve rather thin, 

 ovate, nearly plane, slightly convex near the peak, surface with four or 

 five well marked longitudinal undulating sulci. 



It occurs at Fort Washita with Gryphcea Pitckeri and Ammonites 

 vespertinus. It appears to be quite rare, the specimen figured being the 

 only one furnished by the expedition. 



Inoceramus confertim-annulatus, Eoemer. 



Paleontology, Plate 6, fig. 2. 



Inoceramus confertim-annulatus, F. Eoemer, Texas, 402. Kreidebild. 

 Texas, 59, taf. vii, fig. 4. 



Shell ovate, depressed with close concentric undulating ribs; ribs 

 prominent, rounded, regular, intervals about equal to width of ribs. 



I refer this fossil to the above species with some hesitation, as all the 

 specimens of the collection are either weather-worn or badly mutilated. 

 Nevertheless, if not identical, ours is a closely allied species. Occurs 

 rather abundantly at Camp No. 4, Cross-Timbers, Texas. Dr. F. Roe- 

 mer's specimens are from the Guadalupe, near New Braunfels. 



Trigonia crenulata, Lamarck, 



Paleontology, PI. 4, fig. 1. 



Trigonia crenulata, Roemer, Kreidebild. Texas, 51, taf. vii, fig. 6. 



Shell trigonal, thick, with from fourteen to fifteen oblique crenulated 

 ribs in each valve; anterior side wide, rounded, inflated; posterior side 

 produced, compressed; inferior margin rounded. 



From Cross-Timbers, Texas. All the examples in the collection are 

 internal casts. Roemer cites this species from New Braunfels. 



Astarte washitensis, Shumard. 



Paleontology, PI. 3, fig. 3. 



Shell ovate, trigonal, a little longer than wide, compressed, inequi- 

 lateral, marked with fine concentric rounded striae ; buccal side shorter 

 than the anal, excavated ; basal margin rounded, truncated posteriorly, 

 beaks slightly prominent, excavated. 



