Plate 21. 



Fig. 1. I'sihtstcr yoloi ; Iviic, actinal surface, p. 100. 



2. PcrsephonuHter iiioiio.sloccliiis; type, actinal surlace, p. i;;4. 



3. J'sihistcr rohiisliis: l.vpe, actiiial surface, p. 103. 

 5GS 



