Ft Polymath 977

[woodmont]

FT POLYMATH #977

10a (9 letters) S?T?O?Y?T

"sac in which invertebrates is supposed to be connected to hearing"

[Mamyalynne]

Lithocyst

[woodmont]

BUT........

10 across would seem to be "LITHOCYST" (thanks) ; begins with L :
whch does not fit in with 1 down which would seem to be BOSNIAN
CHOCOLATE ; so 3rd letter down is an S ??! Thanks for your help

[Mamyalynne]

Belgian