  We report the discovery of a group of galaxies at redshift 2.38. We imaged
about 10% of a claimed supercluster of QSO absorption-lines at z=2.38 (Francis
& Hewett 1993). In this small field (2 arcmin radius) we detect two Ly-alpha
emitting galaxies. The discovery of two such galaxies in our tiny field
supports Francis & Hewett's interpretation of the absorption-line supercluster
as a high redshift "Great Wall".
  One of the Ly-alpha galaxies lies 22 arcsec from a background QSO, and may be
associated with a multi-component Ly-alpha absorption complex seen in the QSO
spectrum. This galaxy has an extended (50kpc) lumpy Ly-alpha morphology,
surrounding a compact IR-bright nucleus. The nucleus shows a pronounced break
in its optical-UV colors at about 4000 A (rest-frame), consistent with a
stellar population of mass about 7E11 solar masses, an age of more than 500
Myr, and little on-going star-formation. C IV emission is detected, suggesting
that a concealed AGN is present. Extended H-alpha emission is also detected;
the ratio of Ly-alpha flux to H-alpha is abnormally low (about 0.7), probable
evidence for extended dust.
  This galaxy is surrounded by a number of very red (B-K>5) objects, some of
which have colors suggesting that they too are at z=2.38. We hypothesize that
this galaxy, its neighbors and a surrounding lumpy gas cloud may be a giant
elliptical galaxy in the act of bottom-up formation.
