Raymond. — Paradoxides. 



EXPLANATION OF PLATE. 



Fig. 1. Paradoxides haywardi Raymond. The holotype. Hayward quarry, 

 Braintree, Mass. Nat. size. No. 16, M. C. Z. 



Fig. 2. The same species. A cranidium from the same locality. Nat. size. 

 No. 17, M.C. Z. 



Fig. 3. Paradoxides harlani Green. The cranidium of a young specimen from 

 the same locality as the above. Nat. size. No. 22, M. C. Z. 



Fig. 4. The same species. An imperfect cranidium of about the same size 

 as the cranidia of P. haywardi shown in fig. 1, 2. Same locality. 

 Nat. size. No. 23, M. C. Z. 



Fig. 5, 6. Paradoxides harlani ? Green. * The free cheeks of young individuals, 

 referred to P. harlani rather than to P. haywardi, merely on 

 account of the greater abundance of the first named species. Same 

 locaUty as above. Nat. size. No. 24, 25, M. C. Z. 



Fig. 7. Paradoxides haywardi Raj'mond. A specimen retaining a part of the 

 thorax. The cranidium is imperfect and has been pushed back over 

 the thorax. A part of an overturned free cheek is present at the 

 side. Same locality. Nat. size. No. 18, M. C. Z. 



Fig. 8. Paradoxides sp. ind. A protaspis from the Middle Cambrian at 

 Teirovic, Bohemia. X 16. No. 33, M. C. Z., Schary coll. 

 (The median depression is too long in the figure). 



Fig. 9. Paradoxides rugulosus Hawle and Corda. A young individual from 

 Slap, near Skrey, Bohemia. X 8. No. 423, M. C. Z., Schary coll. 



