Jarr
Possible pseudonym: Mike Ashley in <i>Transformations: The Story of the Science-fiction Magazines from 1950 to 1970</i> points to 'Jarr' being a pseudonym of <a href="http://www.isfdb.org/cgi-bin/ea.cgi?102269">Terry Maloney</a>; Philip Stephensen-Payne mentions Jarr as being Terry Maloney "and possibly one other artist", 'Kenneth Johns' (Ken Bulmer & John Newman) in <i>Science Fantasy</i> #43 talks about a new "team" signing their art "Jarr".