630 
THE VOYAGE OF H.M.S. CHALLENGED. 
have at least four, two of which fall under Grube’s interesting group Notopygos. The 
Aphroditidse, again, for the most part come from deep water, a feature amongst others 
somewhat dividing them from the three other groups (Polynoidse, Acoetidse, and Sigali- 
onidse) usually associated with them. Some of the species from their intermediate 
structure help to clear up the relationships between Aphrodita, Lcetmonice, and Hermione, 
and especially to indicate the steps between the two first mentioned. 
“ The great group of the Polynoidse is very fully represented by about fifty different 
forms. The rotate and stalked papillae on the scales of Euphione elisabethce, n. sp., 
give this form a characteristic appearance, even more so than the remarkable lobes on 
the scales of Lepidonotus cristatus, Grube, also present in the collection. The short and 
ovoid type is represented by Polynoe ipliionoides, n. sp., in which the fleshy part of the foot 
is largely developed. Polynoella levisetosa, n. sp., also short and somewhat elliptic in 
outline, is peculiar in having only a single bristle in the ventral division of the foot. A 
singular modification of the head takes place in Macellicephala mirabilis, n. sp., which 
from this cause and the form of its body might at first sight be mistaken for one of the 
ITesionidae. The sexual differences existing in Polynoe grandipalpa, n. sp., are both 
marked and interesting, the males being more elongated than the females. 
“ Four or five of the groups are commensalistic. One frequents the hexactinellid 
Sponge containing Syllis ramosa, a second accompanies the Crustaceans in Euplectella , 
while a third occurs in the branchial chamber of an Ascidian, and a fourth in the tube 
of Spioclicetopterus just as Polynoe scolopendrina and others do in Britain in the tubes 
of various species. 
“ Two species of Grube’s new genus Eulepis are present. Provisionally they may be 
placed here, though the structure of the body wall somewhat differs from that in the 
Polynoidse. 
“ Without going into detail in regard to the other families, it may be mentioned that 
in all of them new species occur, and in many new genera, but it has not been deemed 
necessary to constitute a new family. 
“ Amongst the most remarkable forms is the branched Syllis 1 ( Syllis ramosa, 
MTntosh, fig. 215), dredged at Station 192, in 140 fathoms off the Ki Islands in the 
Banda Sea, and again in 95 fathoms off Zebu, one of the Philippines ; in both instances 
the greyish mud being peculiarly rich in Euplectellce and other hexactinellid sponges and 
Sipuncidi. The Annelid occurred in the canals of a cup-shaped hexactinellid sponge, 
just above the wisp, but was only observed after preservation. The intricate manner in 
which the branches are arranged makes it difficult to dissect them out, when the friable 
nature of the animal and the sharp spicules of the sponge are taken into account. Even 
after removal from the sponge it is a laborious operation to unravel the Annelid. 
The body of this Syllis is about the thickness of fine sewing thread, branched in a 
1 Journ. Linn. Soc. Lond. (Zool.), vol. xiv. p. 720, 1879. 
