Plural of Inconsistency

mouse → mice
louse → lice
die → dice
house → houses
spouse → spouses
grouse → grouse
spice → spices
tooth → teeth
goose → geese
foot → feet
book → books
boot → boots
beet → beets
cactus → cacti
nucleus → nuclei
bolus → boli
radius → radii
fungus → fungi
graffito → graffiti
biscotto → biscotti
libretto → libretti
concerto → concerti
locus → loci
focus → foci
bacillus → bacilli
syllabus → syllabi
stimulus → stimuli
lotus → lotuses
virus → viruses
alumnus → alumni
alumna → alumnaea
antenna → antenae
formula → formulae
lacuna → lacunae
nebua → nebulae
curriculum → curricula
datum → data
erratum → errata
stratum → strata
corpus → corpora
opus → opera
ovum → ova
referendum → referenda
criterion → criteria
anlysis → analyses
oasis → oases
thesis → theses
crisis → crises
ellipsis → ellipses
parenthesis → parentheses
codex → codices
vortex → vortices
vertex → vertices
axis → axes
axe → axes
medium → media
loaf → loaves
self → selves
elf → elves
scarf → scarves
half → halves
thief → thieves
wife → wives
wharf → wharves
wolf → wolves
ox → oxen
matrix → matrices
child → children
man → men
woman → women
bureau → bureaux
beau → beaux
chateau → chateaux
tableau → tableau
mother-in-law → mothers-in-law
attorney general → attorneys general
child-in-law → children-in-law
major general → major generals
bison → bison
buffalo → buffalo
deer → deer
faux pas → faux pas
fish → fish
craft → craft
offspring → offspring
salmon → salmon
series → series
sheep → sheep
swine → swine
trout → trout
tuna → tuna

The pural of octopus is clearly hexadecapod.

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