1 b. Mouth inferior snotat bluntly rounded or inflated, its top more or less prominent before intermaxillary; cleft of mouth more or less horizontal; uppor. Jaw much. protractile, overlapping lower which is included and has five pores below mandihularly symphysis; snout generally with pores on top, its free border entire or lobate; teeth villiform in bands in both jaws, subequal in mandibularly, in intermaxillary the outer series enlargods, no true caninos; with or whhout mental barbels.......5