PLATE XXVI. 



ECHINOBRISSI FROM THE COBNBRASH, AND CoRAL RaG. 



Cornbrash Species. 



1 a. EcHiNOBRissTJS QUADRATus, Wright, p. 344. Upper surface, natural size. 



b. Under surface of the same test, natural size. 



c. Lateral view of the same, showing the long dorsal slope of the posterior half. 



d. Ambulacral area, poriferous zones, and inter-arabulacral plates, magnified four times. 



Coral Bag Species. 



2 a. EcHiNOBRissus scuTATUS, Lamarck, p. 346. Upper surface, natural size. 



b. Under surface of the same test, natural size. 



c. Lateral view of the same test, showing the tumidity of its sides. 



d. Posterior view, showing the anal valley, and large vent. 



e. Apical disc, magnified more than four times. 



/. Ambulacral area, zones, and inter-ambulacral plates, magnified four times. 



3 a. EcHiNOBRissus DiMiDiATUS, Phillips, p. 350. Upper surface, natural size. 



b. Under surface of the same test, natural size. 



c. Lateral view of ditto, showing the great tumidity of its sides. 



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



4 a. EcHiNOBRissus SCUTATUS, Lavik. A small round variety. 



b. Lateral view of this test. 



c. Ambulacral area, zones, and inter-ambulacral plates, magnified four times. 



Portland Oolite Species. 

 ECHINOBRISSUS Brodibi, Wright, p. 353. See PI. XXXV, fig. 1, a, b, c, d, e. 



