“3. GATTYANA CRISTATA.
(Pl. XLIV., figs. 1-4.)
Pars media dorsalis segmentorum omnium crista transversa praedita ; setae superiores tenerae asperae interdum apice penicillato; elytra perfimbriata, tuberculis crenatis munita.
Three specimens of this interesting species, the first representative of the genus to be recorded from Antarctic waters, were dredged off Franklin Island in 10 to 20 fathoms.
Length of largest specimen 24 mm. ; width from below, including parapodia, but not including setae, 8 mm. ; number of segments, thirty-five.
Characteristic for the species are (1) the cristate dorsum of each segment ; the first crest on the first elytra-bearing segment is rotund, the rest becoming more drawn out transversely until the maximum is reached.
(2) The crenate tubercles of the sub-orbicular elytra. These tubercles are of large size and comparatively few in number in the posterior half of the elytron, graduating in size from the more numerous smaller verrucae of the anterior half. The elytra also carry numerous long filiform fimbriae, both marginal (external and posterior) and extra-marginal.
(3) The tufted tips of the larger dorsal setae. The tip of the setae is produced into a slender flagellum surrounded by a tuft of fine long setulae ; often the flagellum is absent, either lost or undeveloped, and then the setae terminate in a brush. These setae resemble the penicillate setae of Panthalis oerstedi.1
The most dorsally placed setae are feeble and flexible.”
(Willey, 1902)
