Supplement. 

 ' PLATE XLI. 



1 a. NucLEOLiTES RECENS, Mwards. The living representative of tins group from 



Australia, showing the test and spines copied from Professor Milne- 

 Edwards' figure in the illustrated edition of Cuvier's ' Regne Animal 

 Zoophytes,' tab, xiv, fig. 3. 



b. The anal aperture, and its surrounding anal plates. 



2 a. Pedina Smithii, Forbes, p. 176. Upper surface of the test, natural size. 



b. Inter-ambulacral plate, portion of the poriferous zones, and ambulacral area, magni- 



fied three times. 



c. Three pair of pores, greatly magnified. 



3 a. PsEUDODiADEMA LOBATUM, Wriglit. Fragments of tests, with spines, on a slab of 



Lower Lias shale from Pinhay Bay. 

 b. Spine of the same, magnified. 



4 a. Pygasteii megastoma, Wriglit, n. sp. Upper surface, natural size. 



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



c. Lateral view of ditto, ditto. 



5 a. Two inter-ambulacral plates, poriferous zones, and ambulacral areas, of another 



specimen of the same species. 



b. Apical disc of a small specimen of Pygaster megastoma, Wr. 



6. Large spine of Diplocidaris Wrightii, Desor. 



7. Spine of Cidaris pustulata, Wright, with a portion greatly magnified. 



8. Spine of Cidaris. 



