Adler reports that in mss GVM this is not a new entry, but part of sigma 938. In any event there is a disparity, as transmitted, between the headword (nominative singular, as sigma 938) and the two "glosses". See further, next note.
[1] Accusative plural of the headword, apparently; Bernhardy suggested the genitive singular sph/luggos "fissure of a cave", and Kuster agreed. Gaisford compared pi 1506.
[2] This and its variant r(wga/s are nouns related to the verb r(h/gnumi; cf. rho 242.