PIATE XIII {continued). 



Magnotia from the Inferior Oolite. 



Fig. 

 6 a. 



b. 



c. 



d 



e. 



Magnotia Forbesii, Wright, p. 191. Upper surface of the test, natural size. 

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

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

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

 Apical disc, magnified four times. 

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

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



