ii6 University of Michigan 



Plate XVII 



Mlcrospirobolits tridcns, sp. nov. 

 Fig. no. Posterior gonopod, caudal view, x 75. 



Pycnotropis colombicnsis, sp. nov. 



Fig. III. Keels of collum and succeeding two tergites. x 13. 

 Fig. 112. Left gonopod, caudoventral view, x 30. 

 Fig. 1 13. Right gonopod, ectal view, x 30. 



Pycnotropis cylindroidcs, sp. nov. 



Fig. 114. Tenth right keel of male (type), x 13. 



Fig. 115. Seventeenth, eighteenth, and nineteenth right keels in out- 

 line. X 13. 



Fig. 116. Left gonopod, caudoventral view, x 30. 



