from The Century Dictionary and Cyclopedia
- n. In Balanoglossus and. Amphioxus, a downgrowth of the dorsal wall of a gill-slit more or less completely subdividing the latter: so named from its resemblance to the tongue of a jews'-harp.
Sorry, no etymologies found.
_Amphioxus_ the reverse is the case; (b) the tongue-bar contains a large coelomic space in _Balanoglossus_, but is solid in _Amphioxus_; (c) the skeletal rods in the tongue-bars of _Balanoglossus_ are double; (d) the tongue-bar in _Balanoglossus_ does not fuse with the ventral border of the cleft, but ends freely below, thus producing a continuous U-shaped cleft.
From serving primitively as the essential organ of the cleft the tongue-bar may have undergone reduction and modification, becoming a secondary bar in
The chief differences are, that (a) the tongue-bar is the essential organ of the gill-slit in _Balanoglossus_, and exceeds the septal bars in bulk, while in