28 
papillosum. The cephalic setæ are arranged 
in the manner wellknown in this genus, one 
laterally, two subventrally, and two subdorsally 
on eaeh side. I am not able to State with cert- 
ainty whether papillæ are present or not; at 
any rate they must be exceedingly small; even 
with immersion lens I am not quite sure that 
I have perceived them. But in analogy with 
related species there ought to be a ring in 
front of the cephalic setæ. The cephalic mail 
is easily recognizable, from the faet that no 
locules are found in the lobes. The inter- 
lobular spaces are of a rather characteristic 
form. While in the Thoracostomes these spaces 
are commonly more or less circular, in the 
species under consideration they are oblongly 
ovoid, and each space is provided with a back- 
wards directed off-shoot in the lobe on each 
side. The 
almost pear-shaped and rela- 
tively of about the same size 
as in the foregoing species. 
The eyes are large and of 
the same cyathiform shape as 
described above. Caudad to 
the cephalic mail small, papil- 
liform setæ arranged in longi¬ 
tudinal rows are situated. As 
stated by de Man these lon¬ 
gitudinal rows are mainly si¬ 
tuated subventrally and sub¬ 
dorsally; only a few bristles 
are seen caudad to the lateral 
organ. These rows are only 
found in the oesophageal region. 
organ is 
lateral 
Fig. 20. Thoracostoma 
aucklandiæ; tail of female. 
Fig. 21. Thoracostoma aucklandiæ; 
spicular apparatus. 
The female pore is situated 
