Plate XL 



Pedicels of Echinidae, Echinoneidae, Cassidulidae and Spatangidae. 



p. 47, 4;t, 54. 



Fig. 112. The disk of a pedicel in Toxopueustes droebacheiisis O. F. M., siiowiiig the lamiiue ;ind tiie con- 

 verging muscular fibres; p. 49. 



Fig. 113. The central circular space of the same, showing the angular depression and the plicatures of the 

 surface. 



Fig. 114. The same seen from the under side, showing the psellion. 



Fig. 115. A part of the same more highly magnified. 



Fig. lit). The disk of a pedicel in Echinoiieus semilunaris I;.\mck., from above; p. 50. 



Fig. 117. The same, from the under side, with the psellion. 



Fig. 118. The terminal part of a pedicel in Rhynchopygus paciticus Al. Ac, p. 56. 



Fig. 119. The same, in a different state. 



Fig. 120. The disk of a frontal pedicel in Echinocardium cordatum Pe.nn., with the enormously developed 

 spicule; p. 56. 



Fig. 121. A rod from one of the tihnneuts of the same, somewhat shortened, with the basal circlet. 



Fig. 122. Another form of the large spicule under the disk, in the same species. 



Fig. 123. The same spicule, double. 



Fig. 124. Another, spinous form of ihe large spicule. 



Fig. 125. Another form of the same. 



Fig. 12C. Another smaller form of the same. 



Fig. 127. The disk of one of the frontal pedicels in Echinocardium ilavcscens 0. F. M. 



Fig. 128. Tw'O of its filaments with part of the ring, psellion. 



Fig. 129. The rod from one of its HIaments. 



Fig. 130. Spicules from its ring. 



Fig. 131. The terminal part of a frontal pedicel in Breynia Australasia; Le.\ch. 



