Figure 1. — Epibulia ritteriana Haeckel (1888), drawn from the specimen described 

 in this paper. Key to the above is: N - pneumatophore, P - palpons, S - siphons 

 or gastrozoids, T - tentacles with the tentilla, G - gonodendra. 



the emission of the gas through the apical pore. 

 The structure of the pneumatophore, according 

 to Haeckel (1888) includes the pneumatocodon 

 or outer wall of the pneumatophore, which is 

 separated from the inner wall, or pneumatosac, 

 pneumatocyst or air sac, which contains the gas 

 gland; and the hypocystic villi (giant cells) pro- 

 trude from the air sac into the pericystic space. 

 The apical pore is closed by the stigmatis sphic- 

 ter (ring muscle). 



The siphosome is a short cone or ovate bladder, 

 coiled, which Haeckel (1888) described as the 

 "dexiotropic turning of a spire." 



The palpons (feelers or testers) are slender, 

 cylindrical tubes, smaller than the siphons, with 

 a thick muscular wall. They connect into the 

 vascular trunk, and the outer end is armed with 

 cnidocysts. The palpons are consequently then 

 both sensory and protective organs. 



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