a bright galaxy invisible in the optical bands, which was suggested by Chapman et al.(2002b), can not be eliminated.

### SMM J $04433+0210$ in MS $0440.5+0204$

SMM J $04433+0210$ was discovered in the “SCUBA Lens Survey” by Smail et al. (1997, 2002a), and its flux at 850 $\mu$m is 7.2 mJy. There is no detected radio flux for this source down to the 70 $\mu$Jy level at 1.4 GHz (Smail et al. 2002a). An optical counterpart was reported by Frayer et al. (2003) as “N4”, which was detected in their HST/F702W and $K$-band images. Their Keck spectroscopy revealed its redshift as being 2.51.

We measured the $R_{\rm{c}}$ magnitudes for this object as 25.4 and 26.1 for 2and 1 apertures, respectively, although there is a certain amount of contamination from the neighboring bright galaxy “N1”, especially for a 2aperture (figure 7). We also detected this object in the CISCO $K'$ image(“B” in figure 7); the magnitudes are 19.5 and 20.3 for 2and 1apertures, respectively, which are in good agreement with the $K$ magnitude in Smail et al. (1999) and Frayer et al. (2003). The estimated $R_{\rm{c}}-K'$ color is 5.8 for 1diameter magnitudes, and thus it is classified as EROs. It should 