PLATE XIII. 



Fig- 



Fig. 



FisT. 



Fi^. 



Fio-. 



Fig. 



Fiff. 



Fig. 



Fig. 



Figs. 



Fig- 



Fig. 



Fig. 



Fig. 



Fig. 



Pentacrinus asterius, Linn., sp. 



Diara. Page 



1. The calyx and arm -bases, . . . . . x 2 300 



Figs. 2-4. A nodal joint from the upper part of the stem. 



2. Ujiper face, . . . . . . . x 5 17 



3. Lower ftice, . . . . . . . x 5 17 



4. Side view, . . . . . . . x 5 14 



5. A nodal joint from tlie lower part of tlie stem ; lower face, . x 4 17 



6. The same ; upper face, . . . . . x 4 17 



7. Portion of an internode from near the top of the stem, . x 2 18 



8. Nodal and internodal joints from the lower part of the stem. . x 2 30.5 



9. Face of a young internodal joint, . . . . x 5 15 



10. 11. Faces of older internodal joints, . . . . x 4 17 



12. Terminal face of a pinnule-joint, . . . . x 5 10 



13. Termination of an arm, . . . . . x 2 300 



14. One of the middle arm-joints and its pinnule. . . x 4 28G 



15. The ambulacral skeleton of an outer pinnule, . . x 30 79 



IG. Ventral aspect of the hasal joints of a lower pinnule, showing 



the development of its ami )ulacral skeleton, . . x 10 79 



