Of or with respect to branchiaelig or gills
- of or regarding gills (or even to areas of the body derived from embryonic gills)
- Of or with respect to branchiae or gills.
(a.) Of or related to branchiae or gills.
The gill-pores occur on each side of the dorsal aspect of the worm in a longitudinal series at the base of a shallow groove, the branchial groove.