6. Orpheus, and other proper names ending in -eus, form the Vocative Singular in -eu (Orpheu, etc.). But in prose the other cases usually follow the second declension; as, Orpheī, Orpheō, etc.
7. Proper names in -ēs, like Periclēs, form the Genitive Singular sometimes in -is, sometimes in -ī, as, Periclis or Periclī.
8. Feminine proper names in -ō have -ūs in the Genitive, but -ō in the other oblique cases; as,—
| Nom. | Didō | Acc. | Didō |
| Gen. | Didūs | Voc. | Didō |
| Dat. | Didō | Abl. | Didō |
9. The regular Latin endings often occur in Greek nouns.
FOURTH DECLENSION.
ŭ-Stems.
[48]. Nouns of the Fourth Declension end in -us Masculine, and -ū Neuter. They are declined as follows:—
| Frūctus, m., fruit. | Cornū, n., horn. | |||
| SINGULAR. | PLURAL. | SINGULAR. | PLURAL. | |
| Nom. | frūctus | frūctūs | cornū | cornua |
| Gen. | frūctūs | frūctuum | cornūs | cornuum |
| Dat. | frūctuī | frūctibus | cornū | cornibus |
| Acc. | frūctum | frūctūs | cornū | cornua |
| Voc. | frūctus | frūctūs | cornū | cornua |
| Abl. | frūctū | frūctibus | cornū | cornibus |