262 



Fig. 3. Cross-section of the upper wall of the lower cavity of the 

 hydranth. Zeiss DD x 2. 



Fig. 4-9. Serial sections of the upper part of the disc. Zeiss a x 4. 

 Fig. 4. Cross-section through the line 1-1 in Fig. 1, 

 Fio- 5 ^-2 



Fig. 6. „ „ „ 3-3 



Fig. 7. „ „ „ 4-4 



Fio- 8. ij-.^ 



Fio- 9. (^-(j 



Fig, 10. Cross-section of the radial canal and intercalated cord. Zeiss 



BBx2. 

 Fig. 11. Cross-section of the marginal tentacle. Zeiss 83X2. 

 Fig. 12. Longitudinal section of the same. Zeiss a^ x 2. 

 Fig. 13. Terminal branches of a gonosome. Zeiss' ax 2. 

 Fig, 14. Longitudinal section of a branchlet of the gonosome. Zeiss 

 Fx2. e.g. Central, I.g. lateral, globule. 



Fig. 1.^. Central globule with nematocyst {n). Zeiss DD x 4. 

 Fig. IG. Lateral globule in which the bell-nucleus {h.n.) and the endo- 

 derm-cup (enc.) are fairly well recognizable. Zeiss F x 2. 



Fig. A ]iart of the wall of the hydrocaulus with the wavy bands 

 Nat. size. 



Fig. 18. Cros.--section of the mesoderm in the hydrocaulus. Zeiss a x 2. 

 h.J. outer, l(mgitudinally, <•./. inner, circularly, striated layer, .r. spot cor- 

 responding to the wavy band. 



Fig. 19. Mesoderm of the hydrocaulus, macerated with caustic potash. 

 Zeiss a x 2. 



Fig. 20. Surface-view of the root and the sheath. Nat. size. ap. hair- 

 like appendage ; .s. sheath. 



Fig. 21. Longitudinal section of the root figured in Fig 20. Zeiss 

 a X 2. 0. outgrowth of the endoderm: other letters as in F'vj:. 20. 



