494. Four substantives with stems in #-ū-# or #-v-#, #grūs#, F.,
_crane_, #gruis#; #sūs#, M., F., _sow_, _swine_, #suis#; #bōs#, M., F.,
_ox_, _cow_, #bovis#; and #nix#, F., _snow_, #nivis#, follow the
consonant declension; also the genitive #Iovis#, and the other oblique
cases of #Iuppiter# (500). But #sūs# has in the plural dative and
ablative #suibus#, #sūbus#, or #subus#; #bōs# has in the plural genitive
#boum# or #bovum#, rarely #bovom# (107, _c_), and in the dative and
ablative #bōbus#, or oftener #būbus#; #nix# has no genitive plural in
good writers (430): #nivium# late, once #nivum#.