(d).—Where the singular termination -is is changed in the plural into -es:—
| Sing. | Plur. | Sing. | Plur. |
| Amanuensis | amanuenses | Ellipsis | ellipses |
| Analysis | analyses | Emphasis | emphases |
| Antithesis | antitheses | Hypothesis | hypotheses |
| Axis | axes | Oasis | oases |
| Basis | bases | Parenthesis | parentheses |
| Crisis | crises | Synthesis | syntheses |
| Diæresis | diæreses | Thesis | theses. |
THIRD CLASS.
Words wherein the plural is formed by inserting -e between the last two sounds of the singular, so that the former number always contains a syllable more than the latter:—
| Sing. | Plur. | ||
| Apex | sounded | apec-s | apices |
| Appendix | — | appendic-s | appendices |
| Calix | — | calic-s | calices |
| Cicatrix | — | cicatric-s | cicatrices |
| Helix | — | helic-s | helices |
| Index | — | indec-s | indices |
| Radix | — | radic-s | radices |
| Vertex | — | vertec-s | vertices |
| Vortex | — | vortec-s | vortices. |
In all these words the c of the singular number is sounded as k; of the plural, as s.
[§ 82]. The following is a list of the chief Greek
substantives lately introduced, and preserving the Greek plural forms—
FIRST CLASS.