358 ÜHARLES LincoLn EpwArps, Revision of the Holothurioidea. 
Fig. 19. Profile view of a tentacle perforated plate with a central 
erest. 140: 1. 
Fig. 20. View of the posterior end of a very young specimen. ‚Just 
outside of the thiekened rim of the central anus are the five anal teeth, 
each posterior to, and between, the last two pedicels of the radıus. BDv 
bivium, 7v trivium. 7:1. 
Fig. 21. Stone-canal, along the mid-dorsal mesentery, from the edga 
of which the distal, much folded, spherical madreporite projects. 41/,:1. 
Fig. 22. Elongated form of madreporite. 4!/,:1. 
Fig. 23. Developmental stage of the stone-canal and the madreporite, 
from a very young specimen. Madreporite in three folds.. 54:1. 
Fig. 24. Radiale, R, and interradiale, /R, of the calcareous ring 
from a young specimen. Introvert retractor muscle, rm. 9:1. 
Fig. 25. Gonad of a very young individual. M mesentery. 108:1. 
Fig. 26. Right respiratory tree of a very young specimen. q primary 
stem, b secondary stem, © connective tissue strands. 18:1. 
