Fig. 



PLATE XIII. 



Pedinas from the Inferior Oolite. 



1 a. Peuina rotata, Wright, p. 173. Base of the test, natural size. 

 h. Upper surface of the test, showing the apical disc, natural size. 



c. Lateral vie\A^ of the test, natural size. 



d. Apical disc, magnified two and a half diameters. 



e. Inter-ambulacral plate, ambulacral area, and poriferous zones, magnified four times. 



2 a. Pedina Smithii, Forbes, p. 176. Fragment of the test, natural size. 



b. Inter-ambulacral plate, ambulacral area, and poriferous zones, magnified three times. 



c. Lateral view of another specimen, showing the ambulacral and inter-ambulacral 



areas. 



Glypticus from the Coral Mag. 



3 a. Glypticus hieroglyphicus, Goldfuss, p. 186. Under surface of the test, natural 



size. 



b. tapper surface, natural size. 



c. Lateral view, natural size, 



d. Apical disc, magnified two and a half times. 



e. One of the large primary tubercles, magnified two and a half times. 



/ Two inter-ambulacral plates, showing the sculpture, ambulacra, and zones, magnified 

 four times. 



' Polycyphus from the Inferior Oolite. 



4 a. PoLYCYPHUS NoRMANNUs, Desor, p. 196. Test, upper surface, natural size. 



b. Upper surface, magnified once and a half. 



c. Under surface, showing the mouth opening and peristome, magnified once and a 



half. 



d. Apical disc, magnified four times. 



e. Lateral view of the test, magnified once and a half. 



/. Inter-ambulacral and ambulacral areas, showing the arrangement of the tubercles, 

 magnified six times. 



5 a. PoLYCYPHUs DESLOfGCHAMPSii, Wright, p. 199. Test, upper surface, natural size. 



b. Upper surface, with the apical disc, magnified twice. 



c. Under surface, with the mouth and peristome, magnified twice. 



d. Lateral view, magnified twice. 



e. Apical disc, magnified twice. 



/ Inter-ambulacral and ambulacral areas, showing the arrangement of the tubercles, 

 magnified six times. 



