[517]. (1.) Parisyllabic gender stems in -i- with the nominative in -is are declined as follows:

Examples
Stems
tussis, cough,
tussi-, F.
turris, tower,
turri-, F.
amnis, river,
amni-, M.
hostis, enemy,
hosti-, M., F.
Stem and
case endings
Singular
Nom.tussisturrisamnishostis-is
Gen.tussisturrisamnishostis-is
Dat.tussīturrīamnīhostī
Acc.tussimturrim, -emamnemhostem-im, -em
Abl.tussīturrī, -eamne, hoste, -e
Plural
Nom.tussēsturrēsamnēshostēs-ēs
Gen.turriumamniumhostium-ium
Dat.turribusamnibushostibus-ibus
Acc.tussīs, -ēsturrīs, -ēsamnīs, -ēshostīs, -ēs-īs, -ēs
Abl.turribusamnibushostibus-ibus

[518]. (a.) Like the singular of tussis are declined parisyllabic names of rivers and places, like Tiberis, Hispalis. Also cucumis, M., cucumber (but see [491]), and the defectives sitis, F., thirst, Ac. sitim, Ab. sitī, no plural; and vīs, F., power, Ac. vim, Ab. . Plural ([401]): N. vīrēs, G. vīrium, D. and Ab. vīribus, Ac. vīrīs or vīrēs. (The D. is only found twice; a N. and Ac. Pl. vīs is very rare.)

[519]. (b.) The following feminines are declined like turris, with -im or -em in the accusative, and or -e in the ablative:

clāvis, key

febris, fever

nāvis, vessel

puppis, stern

sēmentis, planting

strigilis, skin-scraper