PLATE LXXVIII. 



Pig. 1 a. HoLASTER OBLiQuus, Wright. Under surface, natural size. My collection, 



(P. 313.) 

 \- h. — — — Upper surface, natural size, showing the 



excentral position of the apical disc. 

 \ c. — — — Lateral view, showing the obliquity of the test. 



\ d. — — — Posterior border, showing the central position 



of the vent. 

 \ e. — — — Anterior border, showing the anteal sulcus and 



tubercles and posterior border. 

 2 a. Catopygus pyrii'ormis, Goldfuss. Upper surface and thimble-like depres- 

 sions magnified three times. Museum, 

 School of Mines. (P. 340.) 

 2 ^. — — — Posterior border, with anal area and 



periprocte magnified, do, do. 



2 c. — — — Under surface, showing mouth with lobes 



and petaloidal oral leaves, do. do. 



3 a. EcHiNOBRissus LACUNOsus, Goldfuss. Upper surface magnified four dia- 



meters. My collection. (P. 249, 



250.) 

 8 3, — — — Under surface magnified, showing 



petaloidal oral expansions. 

 The figured specimen was obtained from the " Craie Chloritee de la Sarthe." 



4 a. EcHiNOBRissus MoRRisii, Forbes. Upper surface, highly magnified. My 



collection. (P. 250.) 

 4 3. — — — Under surface, highly magnified. 



The figured specimen was collected from the Chloritic Marl, Chardstock, 



