Gastropod gill morphology P 
Plate 5. SEM and LM micrographs of the gill of Bembicium auratum. A. General lateral view of gill filaments. Bar = 
40 um. B. Detail of dorsal region of a gill filament. Bar = 20 um. C. Detail of dorsal ridge. Bar = 13 um. D. 
General view of the gill in LM section. Bar = 0.2 mm. E. Longitudinal section of gill filaments. Bar = 55 um. 
Key: r, dorsal ridge; s, thin sheet, c, cilia; ct, connective tissue; mc, mucous cells. 
