396 
THE VOYAGE OF H.M.S. CHALLEHGEE. 
The tube from Station 157 consisted of a tough hyaline lining invested by a soft 
greyish mud, which was mainly composed of Radiolarians and Diatoms, the minute and 
long spicules formerly alluded to, a few fragments of Ostracoda, and other debris. Tlu^ 
Radiolarians are much more prominent in this than in the mud from the bottom of the 
sea, or the intestine of the Annelid, probably because the animal selected the largest 
masses for the manufacture of its tube. The tube from Station 152 is long and fragile, 
measuring 190 mm. in length, and having a diameter of 9 mm. In the preparation it is 
somewhat flattened, and has a similar composition to the previous one, only it feels more 
gritty from sand-grains, and coarse spicules of sponges. A large number of Diatoms 
enter into its composition, and it is studded all over with a Globigerina-like form roughened 
with pointed lozenges arranged very closely. Here also the selective power of the animal 
is shown in the divergence between the contents of the alimentary canal and the material 
(‘omposing the tube. The composition of the tul)e from Station 146 is quite different, 
being almost entirely composed of Glohigerince and other Foraminifera. One or two 
Radiolarians occur amongst the former. 
The cuticle foims a. thin layer, but the hypoderm is comparatively thick, especially in 
the ventral mediau line. The nerve-area is small, and has a large neural canal superiorly. 
The circular muscular coat is well marked. Both dorsal and ventral longitudinal muscles 
taper in section from the bulbous exterior border inward, and are nearly equal in size. 
The dorsal muscles approach each other in the median line, but the ventral are widely 
separated, the oblique muscles being attached beyond the outer border of the nerve-area. 
The alimentary canal anteriorly forms a small firm tube, wdth plaited inner lining, at the 
superior central region, the rest of the body-cavity being occupied by coarsely granular 
and large cells, probably pertaining to the perivisceral fluid. 
It is difficult in not a few cases to follow Kinberg’s descriptions ^ of this group, but it 
is possible that his genus Chrysothemis is somewhat allied to Maldanella, though the 
absence of the funnel is a striking difference. 
Maldanella valparaisiensis, n. sp. (PI. XLVI. fig. 12; PI. XL VII. fig. 3; PL XXVa. 
fig. 12). 
Habitat. — Trawled at Station 298 (a little south of Valparaiso), November 17, 1875 ; 
hit. 34° 7' S., long. 73° 56' W.; depth, 2225 fathoms; bottom temperature 35°‘6, surface 
temperature 59°‘0 ; sea-bottom, blue mud. 
The length of the specimen is 64 mm., and its greatest diameter (a little behind the 
front) 5 mm. 
The cephalic lobe is broadly truncate, the marginal lamella being perhaps less 
^ bfversigt Ic. Vetensk.-AJcad. Forhandl, 1866, p. 340. 
