Found a pic of them. All of the aircraft of the 320th BS "WHALE'S TAIL'S" of the 90th BG had "Shark Mouth's painted on their B-24's - both D and J models, OD and Silver color schemes.
On the OD aircraft, the tail markings where just the "Skull & Crossed Bombs" in white on the OD background of the aircraft. Some of this squadron's a/c had the rudders painted red.
On the silver B-24's of the later war era - the tail markings are as in the pic below, for the 320th BS, it is red where the pic in the above post has blue behind the skull.
Even the 320th BS's "Hack Aircraft" "Moby Dick Jr." carried a "Shark's Mouth."