434 
THE VOYAGE OF H.M.S. CHALLENGER. 
some marked with small whitish globules, visible to the naked eye, and due to the 
presence of Eadiolarian skeletons. The lining membrane is quite fragile. Microscopi- 
cally the tubes from Station 156 presented a contrast to the food, abounding much 
more in coarser sand-grains, the nodular rounded bodies with prismatic walls, larger 
Radiolarians, sponge-spicules, and the usual diatomaceous mud. The tubes are tolerably 
straight. One shows a Tubularian polypary attached to its outer surface, so that it must 
have been tolerably free. The tubes from Station 157 are decidedly lighter in hue, being 
greyish-white. Under a lens they present a minutely nodular aspect, small whitish 
or translucent bodies and dots occurring all over, with an occasional glassy sponge-spicule 
projecting from the surface. The microscopical appearances are similar to the foregoing, 
the same kinds of Diatoms, spouge-spicules, and Radiolarians being commou to both. 
Snch portions of the hypoderm as remain show that the layer is of considerable 
thickness. The nerve-cords occupy the typical portion outside the circular muscular coat, 
and the median space between the ventral muscles is much less than in Amphicteis. The 
proportions of the longitudinal dorsal and ventral muscles are similar to those in the 
latter. The great size and muscularity of the proboscis are features of note. Externally 
is a layer of longitudinal fibres, then a massive circular coat upon which the hypodermic 
lining with its somewhat thick cuticular or chitinous investment rests. 
The Amphicteis acutifrons of Grube,^ from Greenland, presents a somewhat produced 
snout and two dorsal papillre, but there the resemblance ceases. 
The genus Otanes of Kinberg ^ is characterised by having only four leaf-like branchiae 
in two rows, but in this form the bristle-tufts go to the posterior end of the body. 
Griibianella antarctica, n. sp., var.'l (PI. XXVIIa. fig. 7). 
Habitat. — Dredged at Station 158 (in the Southern Ocean), March 7, 1874 ; lat. 
50° 1' S., long. 123° 4' E. ; depth, 1800 fathoms; bottom temperature 33°'5, surface 
temperatute 45° '0 ; sea-bottom, Globigerina ooze. ■ 
This is a much smaller specimen than the foregoing, but in other respects it seems to 
be similar. Unfortunately it has been dried, so that only an imjDerfect examination can 
l)e made. The hooks show a slight difference (PI. XXVIIa. fig. 7), since only three teeth 
are visible in profile, and the outline of the anterior inferior process and other parts 
diverges. So far as the hooks are concerned, therefore, this form may be regarded as 
distinct, but in the absence of a more complete specimen it will suffice simply to mention 
these facts. 
The alimentary canal contained diatomaceous mud, in which many Globigerince of 
:dl sizes, but only one or two Radiolarians, occurred. 
1 Arcliiv f. Naturgesch., 1860, p. 109. ^ Ofversigt h. Vetensk.-Akad. Fdrhandl., 1866, No. 9, p. 347. 
