52 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



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Figs. 23-25. Bonnia, species undetermined No. 1 43 



23, Immature cranidium, XlO. 24, 25, Lateral and dorsal views of 

 cranidium, X5. U.S.N.M. 146040. 



Plate 12 



Figs. 1-7. Stigmadiscus stenometopus Rasetti, new genus, new species . Z6 

 1, 2, Dorsal and frontal views of cephalon, X3; U.S.N.M. 146029 

 holotype. 3, 4, Dorsal and lateral views of cephalon, X3. 5, 6, 

 Dorsal and lateral views of incomplete cephalon, X3. 7, Largest 

 glabella observed, X3. U.S.N.M. 146030, paratypes. 



Figs. 8-13. Stigmadiscus gibbosus Rasetti, new species 37 



8, 9, Dorsal and lateral views of cephalon, X4; U.S.N.M. 146031, 

 holotype. 10, 11, Lateral and dorsal views of cephalon slightly com- 

 pressed longitudinally, X5. 12, 13, Dorsal and lateral views of small 

 cephalon slightly compressed laterally, X7.5. U.S.N.M. 146032, 

 paratypes. 



Figs. 14, 15. Kootenia, species undetermined 42 



Posterior and dorsal views of pygidium, X4. U.S.N.M. 146039. 



Fig. 16. Bonnia, species undetermined No. 3 44 



Cranidium, X5. U.S.N.M. 146042. 



Fig. 17. Bonnia, undetermined pygidium 45 



Dorsal view of specimen, X4. U.S.N.M. 146044. 



Fig. 18. Bonnia, species undetermined No. 4 45 



Cranidium, X3. U.S.N.M. 144042. 



Figs. 19, 20. Paedeumiasf, species undetermined No. 2 41 



Incomplete cephala, X5. U.S.N.M. 146037. 



Figs. 21, 22. Olenellus, species undetermined 42 



Incomplete cephala, X5. U.S.N.M. 146038. 



Figs. 23-25. Paedeumias, species undetermined No. 1 40 



23, 24, Incomplete cephala, X5. 25, Meraspid cephalon, XlS, showing 

 small procranidial spines. U.S.N.M. 146036. 



