PLATE XVIII. 



Transverse sections of Ecliinoid Radicle; 



454. Radiolus complanatus, from St. Cassian (Brit 



.Mus., E 10103), X 30 diam 



455. <iCidarisy> Roenicri, from St. Cassian (Brit 



.Mus., E 10104), X 30 diam 



45ii. The same, a small portion enlarged, x yO diam 

 4r>7. Radiolus lineola major, from Jeruzsalemhegy 



(Brit. .Mus., E 10105). The darker areas 



Pag. I Pag. 



j are the only parts at all clear, but the rest 



224 is restored, partly on the evidence of an- 

 other section; X 30 diam 231 



224 458. Radiolus lineola minor, from the Quarry near 



224 Cutting 1 (Brit. .Mus., E lOlOG). Part of 



the section, being rather more obscure than 

 the rest, has been left blank. X 30 diam. 232 



All figures were drawn from the sections by G. T. Gwilua.m, under the Author's direction, at a magnification 

 of 120 and 40 diameters respectively, and were reduced by photography to the present scale. 



