172 MR. CYRIL CROSSLAND ON THE [Feb. 17, 
(3) The parapodia of the region C consist of double neuro- 
podial tori and a clavate papilliform notopodium containing 
a single seta in all the species except P. aciculigerus and 
P. claparedi. 
(4)* Tubes straight, occurring singly in P. claparedi, P. elioti, 
P. major. Twisted together, in numbers, P. socialis and 
P. pictus. 
PHYLLOCHATOPTERUS ELIOTI*, sp.n. (Plate XVI. figs. 1-3 & 8; 
Plate XVIT. figs. 10-13.) 
Of this species numerous specimens occur in Chuaka Bay, 
Zanzibar. The straight, stiff, opaque black tube, 6 to 9 inches 
long, 1s buried in the sand at low tide, one or two inches only 
projecting. Its presence is usually rendered conspicuous by the 
growth of a tuft of bright green enteromorpha on the projecting 
portion. 
The colour of the living animal is milk-white anteriorly, and 
black posteriorly. There is no pigmentation, and the brilliant 
blue and yellow colours described by Claparéde and Lo Bianco in 
the Naples species are not found in either of the two species I 
have seen alive. The black colour of the gut gives the usual 
green solution in alcohol. 
The peristomium is very mobile, the whole shape of the head 
being thus very different in different specimens. When expanded, 
its shape is as in Pl. XVI. fig. 1. In a few cases only, where the 
head is much contracted and bent back, does the prostomium and 
its eye-spots come into view as in fig. 2. 
The first pair of tentacles are very slender and long, attaining 
a length of 9 mm. 
The fore-body measures, in a large specimen, 6 mm. in length 
by 2°5 mm. in breadth, and consists of about 14 setigerous 
segments. (There were 13 in three specimens, 14 in three more, 
and 15, 16, and 17 each in three more. The average is thus 14 
in nine specimens.) The notopodia are very short and stumpy, 
but the setz and their arrangement, as in the other species of the 
genus, recall Chetopterus. The fourth foot has two strong sete 
on each side, rarely three on one side or the other, though in one 
specimen there were three on one side and four on the other. 
The ordinary sete are all straight. 
The region B (fig. 3) consists of from 20 to 25 segments, the 
parapodia of which are very like those of P. gardineri, except that 
the notopodial flap is slightly smaller, and there is a long space 
between it and the ventral portion of the neuropodium, and the 
parts of this latter are of more nearly equal size. The neuropodium 
of the first segment of the gill-region is not divided. There are in 
each notopodium five long setze whose flexible heads project. The 
uncini (fig. 8, c) are triangular with very fine teeth, just visible 
under a 4-inch objective. 
The hind-body has more than 25 segments, but none of my 
1 The tubes of Gardiner’s two species were unfortunately not obtained. 
2 Thus named in honour of Sir Charles Eliot, K.C.M.G., C.B., H.M. Consul- 
General at Zanzibar, and Commissioner for British Hast Africa. 
