a. = = 
ON THE HISTOLOGY OF THE PEDICELLARIA. 395 
PLATE XXII. 
Gemmiform pedicellarie (igs. 1-12). 
Fig. 1. Caleareousvalve viewed from within, x 120. 
Fig. 2. Calcareous valve, with its attached glandular mass viewed from below ; (a) pair of small 
glands, x 120. 
Fig. 3. Transverse muscles of head, x 540. 
Fig. 4, Fibres from muscular covering of glandular mass, x 540. 
Fig. 5. Coiled plate of elastic tissue, x 540. 
Fig, 6. Head of calcareous rod of stem, showing attachment of muscles serving for divarication 
of valves, x 250. 
Fig. 7. The same viewed from above, x 250. 
Fig. 8. Section of stem ; calcareous rod covered by epithelium, x 250. 
Fig. 9. View of head of pedicellaria opened from above, x 60. 
Fig. 10. Section through basal portion of head, x 150. 
Fig. 11. Section through middle portion of head, x 150. 
Fig. 12. Section through upper part of head; only one of the three valves with its attached 
gland is seen, x 150. 
Fig. 13. Trifoliate pedicellaria, x 75. 
Fig. 14. Muscle of cesophagus from Hehinocardium cordatwm, x 320. 
Fig. 15. Muscles of lantern showing alternate darker and lighter strie, the dark striz corre- 
sponding with thick portion of fibre ; (a) fibre showing nucleus, x 540. 
Fig. 16. Muscle of spine showing similar structure, x 850. 
Fig. 17. Branched muscular fibre. 
VOL. XXX. PART I. oP 
