Meaning of electrochemical cell notation without a salt bridge
This is an example of an electrolytic concentration cell.

Both the cathode and the anode have the same electrolyte present and both are in same solution. Thus, there is no need to separate the electrolyte in two different solution and connect by a salt bridge.

The anode and cathode both are metal-sparingly soluble salt-salt anion electrode. The $\ce {KCl}$ solution here is the common electrolyte.

The anode reaction is:$$\ce  {Ag(\text{metal})(s) + Cl^-(\text{salt anion})(aq) -&gt;  AgCl(\text{sparingly soluble salt})(s) + e^-}$$

The cathode reaction is also similar: $$\ce {Hg2Cl2(s) + 2e^- -&gt; 2\ce{Hg}(l) + 2Cl^-(aq)}$$ 

Observe that the $\ce {Cl^-} $ is present in both the reactions as a common electrolyte's ion.