PL.4TE XIII {continued). 



Magnotia from the Inferior Oolite. 

 Fig. 



6 a. Magnotia Forbesii, WrigU, p. 191. Upper surface of the test, natural size. 

 h. Upper surface of the test, magnified once and a half. 



c. Under surface of the test, magnified once and a half. 



d. Lateral view of the same, magnified once and a half. 



e. Apical disc, magnified four times. 



/. Inter-ambulacral and ambulacra] plates, with the poriferous zones, showing the 

 arrangement of the tubercles and the unigeminal disposition of the pores. 



