PLATE LXXVIII. 



Fig. 1 a. HoLASTER OBLiQUUS, Wright. 

 Vh. — — — 



1 c. — — — 



\d. — — — 



I e. — — — 



Under surface, natural size. My collection. 



(P. 313.) 

 Upper surface, natural size, showing the 



excentral position of the apical disc. 

 Lateral view, showing the obliquity of the test. 

 Posterior border, showing the central position 



of the vent. 

 Anterior border, showing the anteal sulcus and 

 tubercles and posterior border. 

 2 a. Catopygus pyriformis, Goldfuss. Upper surface and thimble-like depres- 

 sions magnified three times. Museum, 

 School of Mines. (P. 340.) 

 2 (5. — — — 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.) 



3 (5. — — — 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 <5. — — — Under surface, highly magnified. 



The figm'ed specimen was collected from the Chloritic Marl, Chardstock. 



