POLYCHiETA—BENHAM. 
83 
consist of extremely fine grains of grey sand, looking like mud grains. Such tubes 
have thicker walls than those with coarser grains ; and it is such a tube that Ehlers 
describes. In both kinds I find ech'nid spines, and sponge spicules so embedded as to 
produce a smooth external surface. 
One such tube measures 90 mm. long, with a diameter of 15 mm. at its upper 
end, and its wall is 3 nun. in thickness. 
Most of the worms measure from 50-70 mm., with an anterior width of 7 mm. 
some are larger than this, and one is 90 mm. long. Gravier, however, gives 100 mm. 
as the length of a specimen with 86 segments. 
The number of notopodial bundles varies from 40, 43, 45 and 49 in those 
examined. Gravier gives 54 and Ehlers 48. 
The number of ventral gland shields is 14, 15 and 16, in my specimens. Gravier 
found 14. 
There is no need to add anything to Gravier’s account. 
Localities .— 
Boat Harbour—Among rhizoids of floating brown Alga? (Dr. McLean). 
Boat Harbour, 2-4 fathoms. Station B, 25 fathoms. 
Commonwealth Bay— 
Station C, 15-20 fathoms. 
Station D, 45-50 fathoms. 
Station E, 55-60 fathoms. 
Distribution .—South American Antarctic (Gravier), Kaiser Wilhelm II Land (Ehlers). 
Terebella vayssieri Gravier. 
Phyzelia vayssieri Gravier (1911), p. 130, pi. X, figs. 121-123; pi. XI, figs 
134, 135. 
The tube of this species, of which several were gathered, consists of variously 
coloured sand grains, loosely and irregularly arranged to form a thick wall not unlike 
that of some tubes of T. ehlersi. 
The worms attain a length of 40 mm., with a diameter of 6 mm. anteriorly, at 
about the 8th segment ; the body begins to contract at about the 15th segment to 
4 mm., which diameter is retained for some distance, and then it begins to taper. 
There is one point upon which I lay stress in identifying the worm, and that is 
the form of the uncinus in the anterior segments ; the great length of the basal process 
which starts below the teeth of the uncinus, seems to be characteristic, 
