Full Idea
I should like to show here that the Ego is neither formally nor materially in consciousness; it is outside, in the world; it is a being in the world, like the Ego of another.
Clarification
The Ego is out in the world, not a formal or material part of consciousness
Gist of Idea
The Ego is not formally or materially part of consciousness, but is outside in the world
Source
Jean-Paul Sartre (Transcendence of the Ego [1937], Intro)
Book Reference
Sartre,Jean-Paul: 'The Transcendence of the Ego' [Routledge 2004], p.1
A Reaction
This idea is the germ of what has got modern externalists about the mind (see quotations from Mark Rowlands) interested in Sartre. Personally I think he is wrong, and the Ego is a part of consciousness. It doesn't, though, have sharp boundaries.