PLATE XXIII 



PAGE. 



Hetehocrinus crassus 493 



View of a nearly perfect example of this fine species, showing the arms to their 

 extremities. 



Modioi.opsis, cast — undet 



Cyrtoceiias Carrollensis 496 



AMBOMCHIA iLLlNOIENbIS 495 



Profile view, showing the beak. 

 Side view of a nearly complete valve. 



suuulites inflatus 495 



Asaphvs vigii.ans 497 



View of a rolled specimen showing glabella. 



Tig. 7. Goniophora? 



Cast iu maguesian limestone from the Trenton beds of Carroll county. 



Fig. 8. HOfcOCRINUS AXGUSTATUS 492 



Pig. 9. MODIOLOPSIS SUBNASUTA » 494 



9 a. Side view of a natural cast. 

 9 6. Dorsal view of the same. 



Tig. 



2. 



Fig. 



3. 



Kg. 



4. 





4 a. 





4 b. 



Fig. 



5. 



Fig. 



6. 



