1_ comm. 



Figure 85. A. Entorhipidium echini. (Lynch, 1929.) Cross section, showing periplast 

 of the anterior dorsal fibril. B. Entorphidium echini, tangential section of anterior ventral 

 surface. 



A. b. gr. — basal granule B. comm. — commissural neuro-fibril 



1. p. fib. — longitudinal pellicular fibril I. fib. — longitudinal fibril 



t. — trichocyst p. fib. — pellicular fibril 



tr. fib. — transverse fibril 



