6 
buccal cavity; no doubt these muscles act as protruders to the 
arrow. Just in front of the arrow a ring-shaped chitinous thicken- 
ing is seen, serving — in my opinion — to steer the arrow when 
protruded. The arrow itself is solid and is by no means to be com- 
pared with the spear known in other freeliving Nematodes viz. 
Dorylaimi or Tylenchi. 
The oesophagus is of equal width in its distal half; its proxi* 
mal part forms a large oval bulb in the interior of which a small 
cavity is seen. I am inclined to think that this bulb forms a suck- 
ing apparatus which may be able to bring the biood of the prey, 
wounded by the arrow, into the intestine of the Nematode. — The 
cells of the intestine are large and polygonal; they are filled with 
refringing granules. 
No ventral giand has been observed. The vulva is found some- 
what caudad to the middle of the body. The specimen being a 
young female not fully sexually ripe the genital giand is only found 
as a rudiment; it is situated just in the middle between the vulva 
and the anal opening and consists of a little, nearly egg-shaped 
syncytium with a few nuclei. It is to be supposed that the ovary 
is single and that the place of the female organ is caudad to the 
vulva in mature specimens, a faet not unknown in freeliving Ne¬ 
matodes. 
Halichoanolaimus de Man. 
Halichoanolaimus ovalis n. sp. 
PI. I, fig. 4. PI. II, figs. 3, 7. 
Locality: Auckland Islands. North-arm of Carnley harbour. Clay. 
Length; 1,8 mm. « — 18. /$ = 7,5. y — ? 
Only two specimens were secured, both of them females. The 
shape of the body is short and clumsy; it is of about equal width 
throughout its whole length. At the level of the base of the oeso¬ 
phagus the width begins tapering evenly towards the level of the 
bottom of the buccal cavity whence it continues more rapidly. The 
front end is truncate as is usually the case in this genus. In the 
hind part of the animal the body keeps its width until somewhat 
cephalad to the anal aperture, from where it tapers quickly. The 
shape of the tail somewhat resembles that of H. robustus Bastian, 
