20 
The buccal cavity is relatively long and narrow. The teeth are 
long and pointed; the subventrally situated tooth on the right side 
is the largest. The oesophagus is of about the same width through- 
out its length; only in its hindmost part it increases somewhat 
towards its base. The nerve ring is found in the middle of the 
oesophagus and is very distinet; immediately behind it the exeret- 
ory pore is found. In the foremost part of the oesophagus, a short 
distance behind the buccal cavity, is found a valvular apparatus 
described by de Man in all the species belonging to the sub¬ 
genus Viscoria. Whether it is of quite the same structure as in O. 
giaber or differing in some respects, I am not able to State. 
The vulva is found somewhat in front of the middle; the ante- 
vaginal part of the body is in proportion to the postvaginal part 
as 14 to 17. The female organs are symmetrical and the ovaries 
are reflexed. 
? Oncholaimus vividis Bastian. 
PI. I, figs. 1, 5. 
Locality : Auckland Islands. North-arm of Carnley harbour. Clay. 
Length: ^3,9 mm. a = 65. ft — 7,5. y — 50. 
Two female specimens are present. The shape is siender and 
filiform; the body is in preserved specimens spirally involute. It 
is of about the same width throughout its whole length; at about 
the level of the base of the buccal cavity it tapers abruptly to 
wards the front. The tail is rather short and conical. 
The cuticle is smooth, and bristles are only seen in the fore¬ 
most part of the animal. On the head is found a crown of six 
rather stout setæ, arranged in the usual manner. More caudad two, 
submedially situated bristles are seen; I suppose there are four in 
all, but I have not been able to ascertain this. Besides the here 
mentioned bristles, I have not observed any such scattered over 
the anterior part of the body as Bastian States in O. viridis. 
The buccal cavity is rather spacious and its walls are strongly 
chitinized. The teeth are rather broad at their base; the left sub- 
ventral tooth is the largest one. The oesophagus is rather long and 
of about equal width throughout its whole length. Toward its base 
it increases somewhat in its proximal half. The nerve ring is found 
immediately in front of the middle. 
