25 
Female: cc = 55. j3 = 8. y = 130. 
Male: cc — 63. fi = 7,5. y — 113. 
This is the largest of the Thoracostomes from the Auckland 
and Campbell Islands. But though the female attains the consider- 
able length of more than two centimeters it does not come up with 
other species from the Southern Hemisphere; thus T. setosum, de- 
scribed by de Man from the Belgica-Expedition has a length of 
almost three centimeters. 
The shape of the species under consideration is much like that 
of the above described species; the body is, however, not quite so 
siender. In the front end the body is tapering somewhat more 
strongly; the head is truncate and no constriction is found. The 
cephalic setæ are short and conical and are arranged in the usual 
way. In front of the bristles, near the front end of the head, there 
is a ring consisting of six papillæ two of which are placed later¬ 
ally, the other four respectively subdorsally and subventrally. They 
are very small and semiglobular in shape. Whether the correspond- 
ing nerve is surrounded by a chitinous sheath, as presumed by d e 
Man in T. setosum, I have not been able to ascertain. Perhaps I 
ought to add that concerning this feature de Man 
is not quite convinced; he writes: „le filet nerveux 
de chaque papille est entouré par un petit tube chi- 
tineux, å ce qu’il m’a semblé.“ 
The cephalic mail resembles somewhat that de¬ 
scribed by de Man in T. antarcticum, but it is not 
possible to confound the two forms, on account of 
the peculiar sexual armature found in the male of 
the Auckland species. The posterior edge of each 
lobe is rounded and has a feeble incision in the 
middle, but small anomalies are however common; 
lobes with two incisions are rather often seen. Also 
lobes without any incision are found. In each lobe 
two, nearly reniform, locules are found. 
In the oesophageal region are found longitudinal stomapapiiiomm; 
rows of dense, conical setæ, more or less regularly tai1 of female - 
arranged. These setæ are shorter than those on the head and are 
perhaps, as de Man remarks concerning related forms, more cor- 
rectly to be named papillæ. The eyes are large and form — as 
