22 
In the material from the Auckland- and Campbell Islands are 
found three new species, all seeming to belong to the T. figuratum- 
group. It is rather interesting that five species, known from the 
Southern hemisphere thus are all closely related. 1 ) 
Thoracostoma Campbelli n. sp. 
PI. III, tigs. i, 2, 5. 
Locality: Campbell Island. Perseverance harbour. The coast at 
ebb-tide; under stones. 
Length: Female 16,5 mm. Male 15,2 mm. 
Female: a — 70. ft — 6 . y — 105. 
Male: a = 76,8. — 6 , 5 . y = 115. 
The shape of the body is siender, almost filiform. In the fore¬ 
most end it tapers from about at the level of the base of the oeso- 
phagus. In the hind-part the body is keeping its width unto the 
anal region. The tail is very short and rounded. A characteristic 
feature for this species is that a rather considerable constriction 
is found in the front end about at the level of the lateral organ, 
which recalls the well known constriction in the genus Sabatieria. 
The cuticle is smooth and relatively thick. 
On the head — in front of the constriction 
— a ring of ten short, conical setæ is seen. 
It seems as if these ten bristles are found in 
most of the known species of this genus, and 
arranged in the same way. On each side a 
single bristle is found laterally situated, and the 
other eight are arranged in four groups of two 
bristles each. The two of these groups are si¬ 
tuated subventrally, the other two subdorsally. 
In front of the setæ is seen a ring of four 
rather Jarge papillæ, sublaterally situated. 
The cephalic mail is of the usual shape. 
In each of the six lobes there are, as a rule, 
two locules to be seen, but occasionally there 
are found three of them. In fig. 2 , PI. III is seen 
Fig. 15. Thoracostoma 
that the lobe dorsally to the lateral organ has campbelli; tail of female. 
*) Also the T. polare, described by Cobb from the Shackleton Expedition 
is to be referred to the T. figuratum- group. 
