EXPLANATION OF PLATE I.! 
TUDICLA PLANIMARGINATA Whitf. (p. 33). 
Figs. 1-3. Back lateral and summit views of the type specimen. 
PYROPSIS TROCHIFORMIS Tuomey (p. 41). 
5. Opposite views of two casts showing rounded volutions. 
6. View of a specimen in loose marl showing exterior markings. ; 
7. A small cast showing strong lirations. The-two first specimens are from the collections 
Acad. Nat. Sci., Phila. 
PYROPSIS PERLATA Conrad. (p. 37). 
8-10. Three views of a large cast referred to this species. | 
PYROPSIS ELEVATA Gabb (p. 35). 
11-13. Three views of the type specimen, Acad. Nat. Sci., Phila. 
PYROPSIS RICHARDSONI Tuomey (p. 39). 
14-16. Three views of a cast which appears to be characteristic of the species. 
1 Where not otherwise mentioned, the originals of figures may be considered as belonging to the collection at Rutgers 
College, New Brunswick, or in the State collection at Trenton, New Jersey. 
300 
