PLATE XXVI. 



ECHINOBRISSI FROM THE CoENBRASH, AND CoRAL RaG. 



CornbrasJi Species. 



1 a. EcHiNOBRissus QUADRATUs, Wright, p. 344. Upper soi-fiice, iiatviral size. 

 h. 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-ambulacral plates, magnified four times. 



Coral Rag Species. 



2 a. EcHiNOBRissus scuTATUS, Laviarck, p. 346. L^pper 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, PMlUps, p. 350. Upper surface, natural size. 



b. Under surface of the same test, iiatural 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, Lamk. 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 Brodiei, Wright, p. 353. See PI. XXXV, fig. 1, a, b, c, d, e. 



