12 R.H.M. Eertman 
D 
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Plate6. 5ЕМ and LM micrographs of the gill of Morula marginalba. A. General dorsal view of gill. Bar = 55 um. B. 
Lateral view of a number of filaments. Bar = 0.14 mm. C. Detail of two filaments. Bar = 35 um. D. General 
view of gill in LM section. Bar = 0.2 mm. E. Longitudinal section of gill filaments. Bar = 80 pm. Key: Ic, long 
cilia; c, cilia; nc, non-ciliated cells; ct, connective tissue; mc, mucous cells; hs, haemocoelic space. 
