PLATE XXXVI. 



Pygurus pentagonalis, Phillips. 

 From the Coralline Oolite. 



1 a. Pygurus pentagonalis, Fhillijjs, p. 394. Upper surface, natural size. 



b. Under surface of the same test, natural size. 



c. Lateral view of the same test, ditto. 



d. Apical disc with madreporiform tubercle, magnified. 



2 a. Pygurus pentagonalis, Phillijjs. A large specimen from the Coralline Oolite of 



Malton imbedded in a fragment of that rock. This beautiful fossil 

 belongs to the Scarborough Museum. 

 b. Ambulacral area, poriferous zones, and inter-ambulacral plates, magnified twice and 

 a half times. 



