EXPLANATION OF PLATE IV, 



Spoiiyoitliyllnm eiun-ine, Kth. fil. 



A lai-ye weatlierod specimon, seen riniii alxive. Tlie closely 

 tittiiiii' invaoMuated cu])s are distinctly visible. — Kediiced 

 appfoxiinatt'l V onc-tliiid. 



