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. ×920. 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 is a transverse section through a tentacle of Charybdea at about the middle of Fig. 32, _i. 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. ×920. 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 canal. In the lower part of the figure, the supporting lamella is seen to bend to the right where it becomes continuous with the lamella of the pedalium. ×920. p. 75. [Illustration: CUBOMEDUSÆ. PLATE I. E. W. Berger, del.] [Illustration: CUBOMEDUSÆ. PLATE II. E. W. Berger, del.] [Illustration: CUBOMEDUSÆ. PLATE III. E. W. Berger, del. Heliotype Printing Co., Boston.] End of the Project Gutenberg EBook of Physiology and histology of the Cubomedusæ, by Edward William Berger