176 
THE VOYAGE OF H.M.S. CHALLENGER. 
Two remarkable feet follow tlie foregoing. Each forms a somewhat globular process 
deeply tinged with brownish pigment, and of a firm consistence. Toward the upper and 
anterior region is a minute papilla, while inferiorly two processes or papillse appear on the 
peduncle. 
The bulbous tip of the globular foot is smooth and shining, and somewhat resembles 
an eye, though structurally there is no evidence to support this view. A tendencv 
to a similar enlargement of the same feet occurs in Asterope Candida, D. Chiaje. In 
Alciopa cantrainii of the same author four “ segmental Drusen ” project externally like 
warts on each side a little behind the head. 
The succeeding foot is a minute one of the ordinary kind bearing bristles, and each 
gradually increases in size thereafter, becoming long prominent organs about the twelfth 
foot behind the foregoing globular processes. A fully formed foot (PI. XXXII. fig. 12) 
shows a slightly elevated rugose area on the body- wall just behind its base. The free 
portion consists of three divisions, viz., the superior lamella, the setigerous region, and 
the inferior lamella. The first has the shape of an ovato-lanceolate leaf, with a depression 
on its anterior surface corresponding to the midrib. It is supported on a short peduncle, 
the base of the lamella being slightly though evenly cordate. It is composed internally 
of hypodermic tissue, the cells or areolse of which radiate outward in a fan-shaped manner. 
The next or setigerous region is elongated and acutely pointed, the tip ending in a short 
filiform cirrus above the spine, which projects far outward. It supports the very much 
elongated translucent tuft of simple tapering bristles, which generally show’ a slight 
curvature toward the tip. These bristles do not appear to present anything characteristic 
in structure, except that there is no indication of a central cavity. They are not very 
brittle. None of the extremely attenuate tips are complete. The inferior lamella is 
also ovato-lanceolate, but a considerable portion of its base (the edge of attachment) 
is cut out, so that the upper margin is incomplete. It is nearly as large as the superior 
lamella. 
It is remarkable to find a pelagic form with its eyes placed inferiorly, yet this arrange- 
ment is not uncommon in the Aleiopidse, for several species oi Alciopa, Vanadis,^ and others 
present this feature, though in a somewhat less marked degree than the present species. 
Unfortunately the condition of ^the preparation prevents a minute examination of the 
structure of the body- wall, wdiich, however, in general arrangement seems to conform to 
the type originally given. ^ 
Alciopa (?) quadrioculata, n. sp. (PI. XXVIII. fig. 8 ; PI. XXIX. fig. 7). 
Habitat . — From the surface of the sea at Honolulu, July 1875 ; the surface temper- 
ature was about 76°’0. 
1 Vide R. Greeff, 02 J. cit. 
2 Proc. Boy. Soc. Edin., 1876-77, p. 373. 
