On a $3 \times 3$ board the numbers from $1$ to $9$ are written in some order and without repeating. We say that the arrangement obtained is [i]Isthmian [/i] if the numbers in any two adjacent squares have different parity. Determine the number of different Isthmian arrangements.

Note: Two arrangements are considered equal if one can be obtained from the other by rotating the board.
1. **Identify the structure of an Isthmian arrangement:**
   - An Isthmian arrangement requires that adjacent squares have numbers of different parity (odd and even).
   - On a $3 \times 3$ board, the center square is adjacent to all four edge squares, and each edge square is adjacent to two corner squares and the center.

2. **Determine the placement of odd and even numbers:**
   - To satisfy the parity condition, the center square must be odd (since it is adjacent to four squares).
   - The four corner squares must also be odd (since each is adjacent to two edge squares and the center).
   - The four edge squares must be even (since each is adjacent to two corner squares and the center).

3. **Count the number of ways to place the odd and even numbers:**
   - There are 5 odd numbers (1, 3, 5, 7, 9) and 4 even numbers (2, 4, 6, 8).
   - The 5 odd numbers can be placed in the 5 odd positions (4 corners and 1 center) in $5!$ ways.
   - The 4 even numbers can be placed in the 4 even positions (4 edges) in $4!$ ways.

4. **Account for rotational symmetry:**
   - The board can be rotated in 4 ways (0°, 90°, 180°, 270°), and each rotation results in an equivalent arrangement.
   - Therefore, we must divide the total number of arrangements by 4 to account for these symmetries.

5. **Calculate the total number of distinct Isthmian arrangements:**
   \[
   \text{Total arrangements} = \frac{5! \cdot 4!}{4}
   \]
   \[
   = \frac{120 \cdot 24}{4}
   \]
   \[
   = \frac{2880}{4}
   \]
   \[
   = 720
   \]

The final answer is $\boxed{720}$.