PLATE 74. 



Fig. 1 - 12. Dalmania pleuroptyx. 356 



1. A young specimen whicli is extremely flattened. 



2. The same enlarged, showing more distinctly the characteristic features of the species. 



3 & 4. The head of a young and of a half-grown individual, which are prohahly of this species. 



5. The original preserves the central portion of the head, witli one eye nearly entire. The 

 posterior angles are completed from another sitccimen. 



0. The pygidium of a young specimen. 



7. The pygidium of a larger individual. 



8. A larger individual in which seventeen annulations are distinctly visible in the axis (and 



an eighteenth is very faintly indicated ), and thirteen ribs in each lateral lobe. 



9. Profile of the head, showing the form and elevation of the eye. 



10. The eye enlarged. 



11. A portion of the surface still farther enlarged. 



V2. Amigiiified portion of the eye, where the loiisjs have been removed by weathering. 



Fig. 13 - 20. Dalmania micrurus. 359 



13. The pygidium of a young specimen, contrasting with fig. 6 in the number of annulations of 



the axis and ribs in the lateral lobes. 



14. A small pygidium having fifteen ribs on each lateral lobe, and twenty annulations of the 



axis. 



15. A fragment of a similar pygidium, on which the test is very perfectly preserved. 



16. A larger pygidium from which the test has been removed, leaving the cast punctate. 



17. Profile view of the same. 



18. An enlargement to show the surface markings, from fig. 15. 



19. The pygidium of a medium-sized specimen, showing some variation in form. 



20. The hypostom« probably of this species. The crust has been removed from the central portion. 



