•'! 



32 PLATE XV. [Assembly 



Fossils of the Hamilton group and Tully limestone. 



1. Head of Homalonotus dekayi. 



2. Phacops bffo, partly coiled or contracted. (A magnified represen- 



tation of the lenses of the eye is given.) 



3. Dalmania calliteles. 



4. Stem of plant, undescribed (p. 66). 



( The above are from the Hamilton group. ^ 



5. Ehynchonella subcuboides, front view (p. 68). 



6. Same, side view. 



7. Same, rear view. 



8. Atrypa lentiformis, front. 



9. Same, lower valve, 



10. Atrypa affinis (the fringe-like margin is the edge of the shell 



compressed). 



11. Orthis resupinata, lower valve. 



12. Same, front view. 



( 5 fo 12 are from the Tally limestone.^ 



