REPORT OX THE MY ZOSTOMID A. 
29 
from Actinometra jukesi, P. H. C., and Actinometra strata, P. H. C., the first of which 
was found exclusively at Station 187, the latter at both Stations. Some specimens sent 
to me by Sir Wyville Thomson were labelled “ Myzostomum from disk of Phanogenia ” 
(probably = Actinometra jukesi, P. H. C.). 
2. Myzostoma longipes, n. sp. (Pl. II. figs. 24-28). 
The single specimen that I had measures nearly 2 mm. in diameter. It is ochre- 
coloured, and the flat margin is without cirri and bent upwards so that the animal is quite 
plate-shaped (see ideal section, fig. 27 ). The dorsal surface is covered with minute warts 
especially developed in the centre, where they are separated from each other by deep 
furrows ; on the lateral parts of the dorsal surface they are smaller and closely adpressed. 
Towards the margin, which is hardly at all transparent, they disappear. The thickness of 
the body is in relation to the great development of the muscles ; there is the large cen- 
tral elevation with the radial ridges on the ventral side (fig. 25). The fibrils of the 
parapodial muscles may be distinctly seen with a lens through the wall of the body. The 
basal portions of the parapodia occupy about the middle third of the radius from the central 
muscular mass to the margin of the body. The free ends of the parapodia extend beyond 
the margin of the body, and may be seen from the dorsal surface (fig. 24). The parts of 
the hook-apparatus (fig. 28) are extremely short, but very thick and stout. The tip of the 
hook is slightly bent, and is ‘09 mm. long ; the greatest thickness at the base is *02 mm. 
The manubrium ( ma .) is '05 mm. long, and increases in size at the free end into an obtuse 
shovel-like manubrial plate, which occupies more than one-third of its whole length. 
The muscles of the suckers, like those of the parapodia, are well developed, and the 
suckers themselves are large and distinct. 
The mouth is sub-terminal ; the pharynx is provided with finely serrated walls (ph.). 
The cloacal papilla is on the hind margin of the ventral side. 
Host. — Uncertain. Dredged by the “ Blake” Expedition at Station 269 (St. Vincent). 
3. Myzostoma chinesicum, n. sp. (PI. II. fig. 31). 
This species belongs to the Godefiroy Museum at Hamburgh, and I obtained it through 
the kindness of Dr. J. W. Spengel. It resembles closely Myzostoma horologium in size 
and thickness of body, and like the latter has the dorsal surface flattened and its margins 
turned up ; the majority of specimens — unlike that shown in fig. 31 — display a circular 
contour. The diameter of the disk is 2 '4 mm.; there are no cirri, and the parapodia 
and suckers are without the tubercles seen in Myzostoma horologium. The parapodia 
have a number of circular wrinkles, and the suckers show a beautiful radial folding ; the 
male genital papillae of some individuals are nearly as prominent as in Myzostoma gigas. 
The main feature of this species consists in the uniform brownish-grey colour of the back 
