. Discovery reports. Discovery (Ship); Scientific expeditions. 128 DISCOVERY REPORTS of the posterior lip of the chaeta sac disappears by the loth chaetiger. The gills begin as a single filament on the loth-iith chaetiger (Fig. 46, b) and at the 20th are bifila- mentous (Fig. 46, c). In the present specimens there are never more than two filaments. The fully developed gill is two or three times as long as the dorsal cirrus. All the bristles of the first three modified chaetigers are broken off. The 4th foot contains a dorsal bundle of capillary bristles (Fig. 46, d) and a ventral bundle of com
. Discovery reports. Discovery (Ship); Scientific expeditions. 128 DISCOVERY REPORTS of the posterior lip of the chaeta sac disappears by the loth chaetiger. The gills begin as a single filament on the loth-iith chaetiger (Fig. 46, b) and at the 20th are bifila- mentous (Fig. 46, c). In the present specimens there are never more than two filaments. The fully developed gill is two or three times as long as the dorsal cirrus. All the bristles of the first three modified chaetigers are broken off. The 4th foot contains a dorsal bundle of capillary bristles (Fig. 46, d) and a ventral bundle of com- pound bristles with knife-like blades (Fig. 46, e). There are three long pointed yellow acicula supporting the feet. At the loth foot there are, in addition to the two types of bristles already described, two or three dorsally situated comb chaetae (Fig. 46,/). At about the 20th foot a pair of yellow hooded bidentate subacicular hooks (Fig. 46,^) appear and take the place of the compound bristles. The dental formula is 7—9 : 9 + 6—6, and the details of the jaws are shown in the figure (Fig. 46, h). The anterior part of the lower jaws (Fig. 46, /) is calcareous. Remarks. There are three known species of this rare abyssal genus, R. agassizi, R. brevibrachiata and R. chuni. The present species is distinguished by the low number of filaments to the gills and the character of its bristles. Fauvel apparently does not accept the genus Rhomphobrachiiim, for he redescribes (1923, p. 417) the Diopafra brevibrachiata, Ehlers (1875, p. 49), under the generic name Onuphis. Ehlers (1908, p. 78) has himself recognised that this species falls within the genus Rhamphobrachium. Genus Onuphis, Audouin and Milne-Edwards Onuphis eremita, Audouin and Milne-Edwards. Fauvel, 1923, p. 414, fig. 163 a-l. St. 91. 8. ix. 26. -5 mile off Roman Rock, False Bay, South Africa. 35 m. GearNRL. Bottom: sand. One specimen. Remarks. A single specimen incomplete posteriorly and measuring 23 mm. by 2 mm. witho
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificexpedition
