538 NON-MARINE FOSSIL MOLLUSCA. 



PLATE 20. LARAMIE. 



MELANIA WYOMINGENSIS Meek. (Page 460.) 

 Fio. 1. Lateral view, showing the outline of the outer lip. 

 FIG. 2. Similar view of another example. 



Fia. 3. Similar view of the distal volutions, showing those of the apical portion to 

 be destitute of spines. 



MELANIA INSCULPTA M. (Page 460.) 

 FIG. 4. Fragment of an adult example. 

 FIG. 5. Fragment of a smaller example. 



(Both natural size, and both from Northeastern Colorado.) 



GONIOBASIS CONVEXA Meek & Hayden. (Page 463.) 

 FIG. 6. Lateral view, natural size. 

 FIG. 7. Opposite view of the same example. 



GONIOBASIS CONVEXA var. IMPRESSA M. & H. (Page 463.) 

 FIG. 8. Lateral view, natural size. 

 FIG. 9. Opposite view of the same example. 



GONIOBASIS? OMITTA M. & H. (Page 463.) 

 JiG. 10. Apertural and opposite views; natural size. After Meek. 



GONIOBASIS TENUICARINATA M. & H. (Page 463.) 

 FIG. 11. Apertural and opposite views; natural size. 



GONIOBASIS GRACILENTA M. (Page 463.) 



FIG. 12. Apertual and opposite views of Mr. Meek's type specimen. 

 FIG. 13. Lateral view of an example from Crow Creek, Colorado. 

 (Both natural size.) 



LIMN^A ? COMPACTILIS M. (Page 445.) 

 FIG. 14. Apertural and opposite views of Mr. Meek's type specimen, natural size. 



GONIOBASIS NEBRASCENSIS M. & H. (Page 463.) 

 FIG. 15. Lateral view, natural size. 

 FIG. 16. Opposite view of the same example. 



GONIOBASIS INVENUSTA M. & H. (Page 463.) 

 Fia. 17. Lateral view of the type specimen of Meek & Haydeu, natural size. 



GONIOBASIS SUBL^EVIS M. & H.. (Page 463.) 

 FIG. 18. Lateral view of the type specimen of Meek & Hayden, natural size. 



CERITHIDEA ? NEBRASCENSIS M. & H. (Page 463.) 



FIG. 19. Apertural and opposite views of the type specimen of Meek & Hayden, en- 

 larged. After Meek. 



MlCROPYRGUS MINUTULUS M. & H. (Page 465.) 



FIG. 20. Apertural and opposite views of the type specimen of Meek & Hayden, 

 enlarged. 



CAMPELOMA PRODUCTA White. (Page 469.) 



FIG. 21. Lateral view of an elongate example, regarded as the type. 

 FIG. 22. Opposite view of the same. 

 FIG. 23. Lateral view of a more robust example. 

 FIG. 24. Opposite view of the same. 

 FIG. 25. Lateral view of a subcarinate variety. 

 FIG. 26. Similar view of another example of the same variety. 

 FIG. 27. Similar view of another example of the same variety. 

 * (All natural size.) 



