DESCRIPTION OF THE PLATES. 



TABLE I. 



Fig. 1. Triimdcus Caractaci. 



2. 0()i/(jia Biichii. 



3. Guettardi. 



4. Oclontopk'ura elUptica. 



5. Paradoxides hohtnücm, old specimen. 



6. Bo. do. young. 



7. Bo. do. under part of cephalic shield (irtc/^a/as). 



8. EUijJsocephalm Hoßi. 



9. CoHOcephahis driatas. 



10. Sulzeri. 



11. Harpcs ungula. 



11«. A portion of the sculptiu'c of the margin magnified. 



TABLE IL 



Fig. 1. CulymeHc Bhtmenbachii, rolled up, vie\Aed from the side, drawn from a 

 perfectly-preserved specimen in M. E. Anton's collection. 



2. The same, extended, seen from above. 



3. The same, a front view. 



4. Phacojjs lafifrons, rolled up, side view. 



5. The same, extended, from above. 



6. The same, front view. 



7. Cephalic shield of Calymene Tristani, from above. 



8. The same, from the side. 



9. Cephalic shield of Calymene calliccpliala, from above. 



10. The same, from the side. 



11. Odoniopleura ovata. 



12. Asapkm p)latycephalus. 17 



