Plate XXI. 



k 2 



/ 



10 



Figs. I-S. — Citro|)liyllum ali.serum (Les(|.) I'lt-rry. 



Fig. I. — Allen Pit, South Amboy. 



Figs. .'-i. — Cloud Countv. Kansas. 



Figs. rt-S.— Cliff wood clays. X. J. 

 Fig. 9. — Citrus vulgaris Risso from Florida, for comi>arison. 

 Fig. 10. — Citrus l.imonum Risso from St. Croix, for comj>aris( 



