a PLATE 7. 
Chelone planimentum. 
View of a cast of the under or inner surface of the carapace ; with portions of the ribs 
and marginal plates: one third the natural size. 
pli—pls. Impressions of the costal plates and ribs. 
m11, #12. The eleventh and twelfth marginal plates. 
sul. The eleventh neural plate. 
py. The pygal plate. 
