Plate Xin. 



Walteria leucharti Ij. 



Fig. 4. The al)iuiriiiHlly swollen, upjuT end of the stem in an oUierwise 

 normally developed specimen, -/i ^'^^^- •'^'''''• 



Fig. .5. A part of the stem-wall cut open so as to show tlie gastral surface. 

 7;i uat. size. 



Figs. ')-9. 8 word-shaped dermalia. 150 x . 



Fig. 10. Pentactin-gastralia. 1.50 x . 



Eig. 11. Graph iocome. 300 x . 



Fig. 12. Spherical discohexaster. 300 x . 



Fig. 13. Same, partly broken. 300 x . 



Fig. 14. Portion of a terminal of same. To the right, terminid disc as 

 seen from top. About 1200 x . 



Fig. 15. Onychaster. 300 x. 



Fig. 16. Principal and terminal ray of same. About 1200 x . 



Fig. 17. Another onychaster with more number of terminals. 300 x . 



Figs. 18, 19. Spinose parenchyujal oxyhexactin. 300 x . 



Fig. 20. Terminal portion of a branch, magnified about 5 x. The numerous 

 openings are those of cavities containing hydranths of the commensal 

 Hydrozoa. At the lower end the cortical tissue has been stri|ipcil 

 off, exposing the core composed of parenchymal diactins. 



Fig. 21. Cortical tissue and a ])ortion of the core of a branch in lonjcitudinal 

 section. About 50 x . ^Vlwve, the external surface with dermalia ; 

 below, parenchymal diactins. — cavJnj., cavities containing the 

 hydranth of the commensal Hydroza, with remnant of tissues 

 belon<>;ing to the latter, ccen.. ciunosarc of \W Ilvdrozoa. 



