OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 523 
split in two. This central tooth (fig. 1) is broad, and bears a strong pointed median 
cusp and eight lateral denticles on each side. The divisions between the denticles 
are continued as striz on the body of the tooth. The first lateral (fig. 2) tooth is 
roughly triangular in shape, and bears about twelve fine distinct denticles on the inner 
side, facing the central tooth. The second lateral (fig. 3) is similar, but the top part 
is somewhat straighter and more pointed, and the denticles rather fewer (eight to 
‘nine). The third lateral (fig. 4) is still narrower and more pointed, but has about 
the same number (eight to nine) of quite distinct denticles. The fourth lateral (fig. 5) 
Fias, 2, 3.—First and}second lateral teeth. 
Fic. 1.—Three median teeth, from above. Fies. 4, 5.—Third and fourth lateral teeth. 
Figs. 1 to 5.—Wotaeolidia gigas, 
is smaller, and bears about seven indistinct and inconspicuous denticles. The fifth, 
when it exists, is a minute elongate smooth plate. 
The salivary glands are two long white flocculent bands, 23 m. long and 4°5 wide. 
The digestive organs are almost empty in the larger specimens, and so crushed and 
compressed by the various parts of the reproductive system as to suggest that the 
animals do not take much nourishment during the breeding season. The rather short 
esophagus leads straight into the stomach, which lies on the top of the much swollen 
mucous gland. The interior: of the stomach is laminated. From it proceed two tubes, 
which enter the body wall right and left. Just below them issues the intestine, which 
goes first to the right and then turns backwards. At its commencement it bears 
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