328 



ZOANTHE/E FEOM QUEENSLAND AND THE NEW HEBRIDES. 



Plate 45. 



Longitudinal section through column-wall. X 282. 

 Longitudinal section through sphincter muscle, x 52. 

 Transverse section through oesophageal region. X 70. 

 Transverse section through a perfect mesenterj'. x 188. 

 Hand-cut section showing incrustations. 

 Transverse section through oesophageal region, showing- 

 lacunpe left by decalcification, x 34. 

 Gemmaria arenacea. Longitudinal section through sphincter muscle. X 52. 

 Gemmaria arenacea. Longitudinal section through disc near centre. X 440. 



Fio-. 12. Zoanilms pigmentaius. 



13. Zoantlms pigmentat,us. 



14. Zoanthus pigmentatus, 



15. Zoantlms pigmentatus. 



17. Gemmaria arenacea. 



18. Gemmaria arenacea. 



19. 

 20. 



\ Lettering adopted in the Figures. 



he, basal canal. 

 cu., cuticle. 

 d., diatoms. 

 dist.sph.m., distal sphincter muscle. 

 di., disc. 

 d.m., directive mesenteries. 

 sph.m., sphincter muscle, 

 ect.., ectoderm. 

 ect.b.., ectodermal bay. 

 ect.c, ectodermal canal. 

 ect.m., ectodermal muscle. 



end., endoderm. 

 end.m., endodermal muscle. 

 g.lac, globular lacunte. 



inc., incrustation. 

 lac.d., lacunaj caused by decalcification. 

 l.m., longitudinal muscle. 



m., mesogloea. 

 n.c, nerve-cell, 

 nem., nematocyst. 

 oes., oesophagus. 

 p., parasites. 

 p)b.m., parieto-basilar muscle. 

 pig., pigment, 

 prox.sph.m., proximal sphincter muscle. 

 r.b., refractive bodies. 

 s.d., sulcar directive. 

 s.l.d., sulcular directives. 

 spi., spicule, 

 S23., spermaria. 

 subc, subcuticle. 

 sul.g., sulcar groove. 

 t., tentacle. 

 z., zooxanthellfe. 



