PLATE XXIX. 



Page. 



Glauconia COALVILLENSIS Mock 132 



Fig. 1. Au usually large specimen, showing the umbilicus; the type of Cas- 

 siope whitfieldi (after White). 

 2. An umbilieated specimen from Coalville, Utah, somewhat distorted 

 by pressure. (See PI. XXVIII.) 

 Nat. Mus. Cat. Invert. Foss., 18446. 



TURRITELLA MICRONESIA Meek 131 



Fig. 3. Aperture view enlarged. The outer lip and base of aperture are 

 broken. 



Nat. Mus. Cat, Invert. Foss., 22908. 



Xenophora simpsom n. sp 133 



Nat. Mus. Cat, Invert, Foss., 22909. 

 Fig. 1. Dorsal view of small specimen enlarged two diameters. 



5. Aperture view of a east retaining portions of the shell. Natural size. 

 G. View of base of the same specimen, showing the umbilicus. 



GYRODES conkadi Meek 13G 



Fig. 7. Dorsal view of an example from Huerfano park, Colorado. 

 Nat, Mus. Cat. Invert. Foss., 22910. 

 8. Aperture view of the type (after Meek). 



Lunatia concinna H. & M. ? 131 



Nat. Mus. Cat. Invert, Foss., 22911. 

 Fig. 9. Aperture view. 



10. Dorsal view of another specimen, showing the revolving sculpture. 



Gyrodes depressa Meek 135 



Nat. Mus. Cat, Invert. Foss., 2^)12. 

 Fig. 11. Aperture view of a medium-sized specimen. 



12. Dorsal view of a large example. 



13. Aperture'view of another specimen differing slightly in form. 



14. Dorsal view of a specimen in which the spire is unusually promi- 



nent and elevated. 



250 



