PLATE XXXIX. 



PvGURUs Phillipsii, Wright. 



From the Coralline Oolite. 



1 a. Pygurus Phillipsii, Wright, p. 403. Upper surface, natural size. 



h. Posterior view of the same test, showing the depression of the upper surface and 

 the undulation of the base. 



c. Two inter-ambulacral plates, a portion of the poriferous zones, and ambulacral area, 



magnified three times. 



d. A portion of an ambulacral area, with its poriferous zones, magnified eight times. 



2. Pygurus Hausmanni, Koch and Bunker, p. 405. Two of the inter-ambulacral 

 plates, a portion of the poriferous zones, and ambulacral area, magnified 

 three times. 



