Each set of animated textures is controlled by an object. In that object's init code is something like this:
      HIBYTE(v1->field_2) = AniTexs_ECoast2_1[0].TexID;
      *(_DWORD *)&v1->CharIndex = AniTexs_ECoast2_1;
      v1->gap_a[2] = 12;
      v1->gap_a[3] = 15;
v1->gap_a[2] is the number of entries in the list, and v1->gap_a[3] is the number of textures in the animation.
The data itself is in this format:
00000000 TextureAnimationData struc ; (sizeof=0x10)
00000000 Model           dd ?                    ; pointer to the model being animated
00000004 MatCount        db ?                    ; number of MATERIALs to animate (max 8)
00000005 MatIDs          db 8 dup(?)             ; ID numbers of materials
0000000D TexID           db ?                    ; ID# of the texture to start at ;first model in list controls this
0000000E TexTime         dw ?                    ; amount of frames to display each texture ;first model in list controls this
00000010 TextureAnimationData ends