Plate Xin. 



Walteria leuckarti Ij. 



Fig. 4. The abnormally swollen, upper end of the stem in an otherwise 

 normally developed specimen. -/:; "'^^- '^^^^'• 



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

 -/s nat. size. 



Figs. 6-9. Sword-shaped dermalia. 150 x . 



Fig. 10. Pentactin-gastraha. 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, terminal 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 parenchymal 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[)])ed 

 off, exposing the core composed of parenchymal diactins. 



Fig. 21. Cortical tissue and a portion of the core of a branch in longitudinal 

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

 below, parenchymal diactins. — cav.liy., cavities containing the 

 hydranth of the connuensal Ilydroza, with remnant of tissues 

 belon-rinu: to the latter, cœn., cœnosarc of the Hydrozoa. 



I 



