PLATE 2 



All specimens photographed with transmitted light. Color of filter, when 

 used, indicated. 



Triletes subpilosus (Ibrahim) Schopf, Wilson, and Bentall (sensu Dijkstra) . p. 17 



Figure 



1. Proximo-distal compression. Diameter 840 p. Maceration 795 slide 6, 

 coal in Caseyville Group, Wabash County, Illinois. Red filter, scale in- 

 dicated below figure, (x40). 



2. Lateral compression. Apical prominence and contact area spines 

 characteristically developed. Maceration 795 slide 4, coal in Caseyville 

 Group, Wabash County, Illinois. Red filter, same scale as figure 1, 

 (X40). 



3. Lateral compression. Width 940 jx. Maceration 795 slide RMK, coal in 

 Caseyville Group, Wabash County, Illinois. Red filter, same scale as 

 figure 1, (x40). 



4. Detail of stout spines. Maceration 587 slide 3, Battery Rock Coal, Har- 

 din County, Illinois. Red filter, same scale as figure 5, (xl50). 



5. More delicate spines. Maceration 797 slide 3, coal in Casevville Group, 

 Wabash County, Illinois. Red filter, scale indicated below figure, 



(X150). 



Triletes horridus (Zerndt) Schopf, Wilson, and Bentall (sensu Dijkstra) . . p. 20 



6. Side view of large and subsidiary spines. Maceration 200 slide 3, in 

 Degonia Formation, Pope County, Illinois. Red filter, same scale as 

 figure 5, (X150). 



7. Lateral compression with delicate spines. Total length 1045 fi. Macera- 

 tion 905 slide 2, "Makanda" Coal, Jackson County, Illinois. Red filter, 

 same scale as figure 1, (x40). 



8. Proximo-distal compression. Diameter 920 (U . Maceration 905 slide 2, 

 "Makanda" Coal, Jackson County, Illinois. Red filter, same scale as 

 figure I, (X40). 



9. Characteristic lateral compression. Total length 1010^. Maceration 905 

 slide 2, "Makanda" Coal, Jackson County, Illinois. Red filter, same 

 scale as figure 1, (x40). 



10. Lateral compression. Smaller spore with more closely spaced spines, 

 but with apical prominence of normal size. Total length 865 p. 

 Maceration 907 slide 6, '"Makanda" Coal, Jackson County, Illinois. 

 Red filter, same scale as figure 1, (x40). 



11. Detail of characteristically developed well preserved spines. Small 

 subsidiary spines present. Maceration 796 slide 6, coal in Casevville 

 Group, Wabash County, Illinois. Red filter, same scale as figure 5, 

 (X150). 



12. Detail of slightly worn spines. Small subsidiary spines present. Macera- 

 tion 905 slide 2, "Makanda" Coal, Jackson County, Illinois. Red filter, 

 same scale as figure 5, (xl50). 



[107 



