186 
THE VOYAGE OF H.M.S. CHALLENGER. 
the British Museum/ but the preparation otherwise is not in a condition for mi mite 
scrutiny. 
Hesione (?) (PI. XXXII. fig. 15 ; PI. XVa. figs. 8, 9). 
Habitat. — Dredged in shallow water off St. Thomas, West Indies. 
A fragment of the posterior end of a Hesione-\\kQ form, consisting of a considerable 
number of segments of uniramous feet. The dorsum is rounded and the ventral surface • 
grooved. The body-cavity is filled with a vast number of granular cells, probably ova, 
which also occur in masses in the feet. 
Each foot (PI. XXXII. fig. 15) has dorsally a long filiform, slightly jointed cirrus 
attached to a basal segment, a pointed setigerous region beneath, with the bristles 
divided into two groups by the papilla of the spine. The ventral cirrus is short and 
tapered. The bristles above the spine have more slender shafts and more elongated tips. 
The distal end of the shaft is devoid of transverse markings, but it has a peculiar longitu- 
dinal wrinkle just below the tip, and this is present in all the bristles, both superior and 
inferior. The latter bristles are somewhat stouter, and the tips shorter (the usual 
gradation occurring from above dowmward, as indicated in PI. XVa. figs. 8, 9 — the 
former representing an inferior bristle, the latter a superior). The extremity has a 
terminal hook with a long spur beneath. The transverse markings are very well shown 
in the shafts below'the regions figured. The anus is terminal. 
In transverse section, the nerve-cords lie beneath the insertions of the oblique and 
vertical muscles, which form a continuous arch. The hypoderm and cuticle occur 
externally. 
Dalhousia,‘^ n. gen. 
Body moderately elongated, head somewhat resembling that in Tyvrliena, viz., with 
a subfrontal tubercle, but devoid of the median tentacle. Maxillae absent in the pre- 
paration. Tentacular cirri eight. Foot with simple slender setae dorsally, and bifid 
bristles ventrally. 
Dalhousia atlantica, n. sp. (PL XXIX. fig. 3 ; PI. XXXIII. fig. 2 ; PI. XVa. 
figs. 5, 6, 7). 
Habitat. — Dredged at Station 3 (south of the Canaries), February 18, 1873 ; lat. 
25'" 45' N., long. 20° 14' W.; depth, 1525 fathoms; bottom temperature 37°, surface 
temperature 65° ; hard ground. 
1 Spinola, N. S., 22nd Febmary 1821. 
Named after tlie Earl of Dalbousie, K.T., who has both earnestly and practically interested himself in the 
marine fisheries of this country. 
