Mitral valve/semilunar valve lies between left auricle and left ventricle.

Explanation

To answer the question regarding the location of the mitral valve and the semilunar valve, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Identify the Structures**: Begin by recognizing the key structures mentioned in the question: the left auricle (also known as the left atrium) and the left ventricle.

2. **Locate the Mitral Valve**: The mitral valve is specifically located between the left auricle and the left ventricle. It is also known as the bicuspid valve because it has two flaps (cusps).

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