[sedachv]

I'm going by the Hyperspec and what I remember from reading Kaisler's Interlisp. From the former:

"One of the Interlisp ideas that influenced Common Lisp was an iteration construct implemented by Warren Teitelman that inspired the loop macro used both on the Lisp Machines and in MacLisp, and now in Common Lisp."

http://www.lispworks.com/documentation/HyperSpec/Body/01_ab....

[lispm]

It influenced it the Maclisp LOOP. The idea. That's all. The CL LOOP macro OTOH is a straight version of the Maclisp version. The MIT version of LOOP came from the same sources, even.

The Interlisp iteration facility looks slightly different. There are Interlisp manuals as PDF at bitsavers...