Genitive Plural of "mare" (sea)

Latin Learning Latin
1

Allen and Greenough (page 32) says that the genitive plural is “marum” and that this occurs “once only.”

“Latin for Canadian Schools” says that the “genitive plural of mare is lacking.”

“Our Latin Legacy” gives the genitive plural as “marium.”

If I take Allen and Greenough as the final authority, what is the source of “marum”?

2

Naevius, according to Priscianus, gen. plur. marum, Naev. ap. Prisc. p. 770 :



et sciendum tamen, quod rarissime haec, quae in solam i finiunt ablatiuum, syncopam patiuntur i per genetiuum pluralem. inueni marum pro [p. 352 vol. II Keil] marium, qui tamen in rarost usu genetiuus, apud Naeuium in carmine belli Punici : «senex fretus pietatei deum adlocutus summi / deum regis fratrem Neptunum regnatorem / marum », pro marium. eius ablatiuum Caesar in V belli Gallici ponit: «paulo latiores quam quibus in reliquis utimur maribus».

3

Thanks for this!