EXPLANATION OP PLATE I.' 



TUDICLA PLANIMARGINATA Whitf. (p. 33). 



ftos. 1-3. Back lateral and Mummit views of the type specimen. 



PrROPSis TKOCHiPORMis Tuomey (p. 41). 



4,5. Opposite views of two casts showing rounded volutions. 



6. View of a specimen in loose marl showing exterior markings. 



7. A small oast showing strong lirations. The two first specimens are from the collections 



Acad. Nat. Set., Phila. 



Pyropsis perlata Conrad, (p. 37). 



8-10. Three views of a large cast referred to this species. 



Pyropsis blbvata Gabb (p. 35). 



11-13. Three views of the type specimen, Acad. Nat. Sci., Phila. 



Pyropsis Richakdsoni Tuomey (p. 39). 



14-16. Three views of a oast which appears to be characteristic of the species. 



' Where not otherwise mentioDed, the orifcinala of figures may be considered as belonging to the collection at Rutgers 

 College, New Brunswick, or iu the State collection at Trenton, New Jersey. 

 300 



