PLATE XIV. 



StomecMni from the Inferior Oolite. ■ 



Fi'. 



1 a. Stomechinus germinans, PJuUips, p. 204. Lateral view of the test, natural size. 



b. Base of the test, showing the wide mouth opening and deeply notched peristome. 



c. Ambulacral area, poriferous zones, and two inter-ambulacral plates, magnified three 



times. 



d. Base of an inter-ambulacral area, showing the arrangement of the ranks of pores, 



magnified three times. 



2 a. Stomechinus intermedius, Agassiz, p. 208. Upper surface of the test, natural size. 



b. Base of the test, showing the mouth opening and peristome, natural size. 



c. Lateral view of the same, natural size. 



d. Ambulacral area, poriferous zones, and two inter-ambulacral plates, magnified three 



times. 



e. Apical disc, magnified two diameters. 



3 a. Stomechinus bigranularis, Lamarck, p. 210. Upper surface of the test, natural 



size. 

 b Base of the test of a larger specimen, showing the small mouth opening, natural size. 



c. Lateral view of a, showing the excentral apical disc. 



d. Ambulacral area, poriferous zones, and two inter-ambulacral plates, magnified three 



times. 



e. Apical disc, magnified two diameters. 



Stomechinus from the Coral Mag. 



4 a. Stomechinus gyratus, Agassiz, p. 215. Upper surface of the test, natural size. 



b. Base of the test, showing the mouth opening and peristome, natural size. 



c. Lateral view of the same, showing the tubercular inter-ambulacra, natural size. 



d. Ambulacral area, poriferous zones, and inter-ambulacral plates, magnified three times. 



e. Apical disc, magnified two diameters. 



