PLATE XVI. 

 Dalmanites (Cryph^ius) Boothi. 



Page 42. 

 Plate 16 \. 

 1. Am entire individual, of about average adult proportions, showing the short an. I broad genal 

 spines, anodose axis and d :audal fimbi 



Pig. 2. Profile of the same, showing 'In' broad, blunt and laterally flatte I genal i 



Hamilton group. Canandaigua Lake. 

 ;!. A small cephalon, pr< orrnal prop the genal spines 1 ored 



Hamilton group. Canandaigua Lake. 

 Pig. 4. A fragmentai-y specimen, showing the usual characters of thorax and pygidium. 

 Hamilton group. Canandaigua Lake. 



Dalmanites (Cinrii.i.us) Boothi, var. Calliteles 



Page 1 5 

 See Plate 16 a. 



Fiy. 5. A very young individual, drawn in outline and partially restored. This is the earliest stage of 

 growth noticed, and an enlargement of the pygidium is given on plate 16 x. fig. 12. 

 Hamilton group. Canandaigua, Ontario county. 



6. An individual in a later stage of development, partially restored. An enlargement of the pygi- 



dium is given on plate 16 A, fiir. 13. 



Hamilton group. Canianaaigua, 



7. An individual in a more advai I stage oi growth than the pr ling, partiallj restored, in 



enlargement of the pygidium is given on plate 16 A, fig. 14. 

 Hamilton group. Canandaigua, Ontario county. 

 Fig. 8. A still larger individual, slightly incurved, and thus made to appear broader than normal. 



Hamilton group. Canandaigua, Ontario county. 

 big. 9. A slight! j larger individual, also somewhat enfolded. This example preserves the axial row of 

 nodes, and rounded, but pustulose caudal spines. The genal spines, however, are like those of 

 the sp' thi rather than those 1 of the variety Calliteles, and the specimen represents a 



form intermediate between normal examples of the species ami its varietj 

 Hamilton group. Canandaigua Lake. 

 Pig. in. An individual in a la gr iwth, showing the long, slender caudal spines. 



Hamilton group. Canandaigua. Ontario county. 

 Pig. 11. An individual, somewhat below the normal adult size, but showing all tin- characteristic: of the 



variety. 

 Fig. 12. Profile of the same, showing the long, acute genal spines. 



Hamilton group. Canandaigua, Ontario 'county. 

 Fig. 13. A normal individual, of average size. 



Hamilton group. Canandaigua, Ontario county. 

 Fig. 14. The individual represented in fig. 9. Enlarged to two diameters. 



I.">. The same in profile, showing the character of the genal spines 

 Pig. 16. A very large cephalon. 



Hamilton group. Canandaigua Lake. 

 Big. 17. A thorax and pygidium, of unusually large size. 



Hamilton group. Canandaigua L< 

 Fig. 18. An enrolled individual, showing the caudal fimbria projecting beyond tin' frontal border. 



Hamilton group. Near LeRoy, ffeneset county. 

 Fig. 19. Anterior view of a smaller, partially enrolled individual. 

 Fig. lid. Lateral view of the same. 



