A dorsal and hollow central nervous system is found in

Options

A. Bufo
B. Loligo
C. Dentalium
D. Limulus

Answer

To solve the question "A dorsal and hollow central nervous system is found in", we will analyze the options provided and identify which one corresponds to the characteristics of a dorsal and hollow central nervous system.

### Step-by-Step Solution:

1. **Understanding the Characteristics**:
- A dorsal and hollow central nervous system is a defining feature of chordates. This means that the nervous system is located on the dorsal side (the back) of the organism and is hollow, forming a tube-like structure.

2. **Analyzing the Options**:
- **Option 1: Bufo**: This is a genus of toads, which are amphibians. Amphibians are chordates and possess a dorsal and hollow central nervous system.
- **Option 2: Loligo**: This is a genus of squid, which are mollusks. Mollusks do not have a dorsal and hollow central nervous system; instead, they have a more decentralized nervous system.
- **Option 3: Dentalium**: This is a genus of scaphopod mollusks. Similar to Loligo, they do not have a dorsal and hollow central nervous system.
- **Option 4: Limulus**: This is a horseshoe crab, which is an arthropod. Arthropods also do not have a dorsal and hollow central nervous system.

3. **Identifying the Correct Answer**:
- Among the options, only Bufo (the toad) is a chordate and has a dorsal and hollow central nervous system. The other options (Loligo, Dentalium, Limulus) are non-chordates and do not possess this type of nervous system.

4. **Conclusion**:
- Therefore, the correct answer to the question is **Bufo**.

### Final Answer:
**Bufo**