84 JOHNS HOPKINS UNIVERSITY MORPHOLOGICAL MONOGRAPHS. 
The mass with darkly stained granules is the remains of a thread cell. The 
ectoderm and asmall part of the supporting lamella only are figured. Note the 
large ganglion cell. X920. pp. 74, 75. 
Fig. 29. Part of a transverse section of a tentacle of Tripedalia. The endoderm 
is not figured. The supporting lamella is seen to be considerably thinner than in 
Charybdea. Note the subectodermal muscles, as also the muscle fibers to the thread 
cells. X920. pp. 69, 74, 75. 
Fig. 30. This is a transverse section through the endothelium of a tentacle of 
Charybdea in the line c d of Fig, 32. The dark lines bounding the polygonal areas 
are the thickenings of the sides of the walls of the cells in the line indicated. The 
central dots are the centrad continuations of the flagella. 920. p. 76. 
Fig. 31. This figure isa transverse section through a tentacle of Charybdea at 
about the middle of Fig. 32, 7. e. so near to where the tentacle joins the pedalium, 
that the muscles within the lamella have all come to lie under the ectoderm. The 
ectoderm is not shown. X920. pp. 75, 76. 
Fig. 32. <A longitudinal section through the supporting lamella only, of a 
tentacle of Charybdea, is here shown. In the upper part of the figure the muscle 
fibers are seen wholly enclosed by the supporting lamella. In the middle of the figure 
they are seen to pass out of their cana]. In the lower part of the figure, the support- 
ing lamella is seen to bend to the right where it becomes continuous with the lamella 
of the pedalium. 920. p. 75. 
