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We present very deep $HST$ WFPC2 images in the F814W filter of two HawaiiSurvey fields, SSA13 and SSA22. Using these data with previous ground-basedimaging and spectroscopy, we compare the colors, star-forming properties andmorphologies of the faintest galaxies with a reference sample of bright nearbygalaxies and analyze the changes in field galaxy morphology with magnitude. Ourprincipal result is the identification of a new morphological class of``chain'' galaxies at the faintest magnitudes. Based on limited spectroscopy,we tentatively conclude that these are linearly organized giant star-formingregions at $z = 0.5-3$ and, if this is correct, that these are large galaxiesin the process of formation.Comment: 18 pages + 1 table of text as 1 LaTeX file (uses aastex style macros:  aaspp.sty, flushrt.sty) plus 1 uuencoded compressed tar file of 12 PostScript  figures (Figs. 3-9, 16-17, and 21-23). The remaining gray-scale plots are  available by anonymous ftp at  ftp://hubble.ifa.hawaii.edu/pub/preprints/plates To appear in the October  1995 Astronomical Journa

Faintest Galaxy Morphologies From HST WFPC2 Imaging of the Hawaii Survey Fields