460 GEOLOGY OF THE BLACK HILLS. 



SECTION V. 



SYNOPSIS OF SPECIES FROM THE BLACK HILLS, NOTICED 

 IN OTHER WORKS, NOT DESCRIBED IN THIS REPORT. 



POTSDAM SPECIES. 

 IAngulepis prima (Conrad) Meek. 



Mr. Meek recognizes a form under this name from the central parts of 

 the Black Hills, in the Paleontology of the Upper Missouri (Smithsonian 

 contribution), p. 3, PI. 1, Fig. 2. 



Ifyolithes gregaria = Theca gregaria M. & H. 



Mr. Meek gives this species as from the Big Horn Mountains (Pale- 

 ontology of the Upper Missouri, p. 5), and we remember having seen 

 remains of a similar or identical form in the collection of Colonel Ludlow's 

 expedition of 1874. 



Agranlos f sp. ?, in Pal. Up. Missouri, p. 10. 



Mr. Meek cites a species as above from the sandstones of the central 



Black Hills. 



JURASSIC SPECIES. 



Ostrea englemanni Meek, Pal. Up. Missouri, p. 73. 



A single imperfect valve of this species too poor for use occurs among 

 the fossils from southeast of Warren Peak, in the Redwater Valley. 



Trigonia conradi M. & H., Pal. Up. Missouri, p. 83, PI. 3, fig. 11. 



Southwest base of Black Hills, in Lower Jurassic 

 Unio nucalis M. & H., Pal. Up. Missouri, p. 92, PI. 3, fig. 13. 



In Jurassic rocks, southwest base of Black Hills. 

 Astarte inornata M. & H., Pal. Up. Missouri, p. 94, PI. 3, fig. 12. 



Southwest base of Black Hills, in Jurassic rocks. 

 Tancredia f wquilaterah's M. & H., Pal. Up. Missouri, p. 96, PI. 3, fig. 8. 



In Jurassic beds, southwest base of Black Hills. 



