REFERENCES 405 



pairs of them being interconnected by cytoplasmic bridges, some of which surround fibrillar strands 

 thought to represent Hirschler's 'fusom'. 



(16) Isorhizas discharge in an electrical field while in situ, but not when isolated. Discharge is 

 inhibited by anaesthetics, either partially or completely depending on their strength. Cold acts in the 

 same way. 



(17) Endodermal glandular cells, presumed to produce proteolytic enzymes, occur in the distal part 

 of the gastrozooids. Certain cells in the proximal region are also of a glandular character. The cells of 

 the villi are phagocytic. The dark matter in them appears to derive from dermal pigments of captured 

 fish. Nematocysts, apparently taken in with the food, also occur together with other matter under- 

 going digestion in the villus cells. The histology of the endoderm of palpons resembles that of 

 gastrozooids except that the buccal gland cells are relatively less well developed. 



(18) Non glandular absorptive cells occur throughout the endoderm in non-digestive regions, 

 together with ' goblet ' cells. All endoderm cells are flagellated but exceptionally long flagellae (25 n) 

 are associated with the buccal endoderm of the gastrozooids. 



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