4 
of the spicules makes 163 //. Cephalad to the anogenital aperture 
two tiny masculine papillæ are seen the most caudad of which is 
situated 9 /li from the anus, the other one 12 ^ more cephalad. 
The hind-part of the body of the male is strongly curved; only 
the tail itself is almost straight, a feature not common among Ne- 
matodes. 
Oistolaimus n. g. 
Body of a rather short and clumsy shape. The cuticle is finely 
striated and set with scarce hairs, spread apparently irregularlv over 
the surface of the body. Head with one ring of fine hairs, the 
position of which is between the low lips which surround the mouth- 
opening. Lateral organ spiral-shaped and much like that known in 
the genus Desmodora ; it is situated in the front end, just behind 
the lips. The buccal cavity is cup-shaped in its distal half; its 
proximal half, which is nearly cylindrical, is occupied by a short 
spear or arrow, the stem of which is slightly curved and which is 
provided with a barb on one side, much like that of a fish-hook. 
The arrow is no doubt protrusile, and strong muscles which evid¬ 
ently act as protractors are attached to its stem. The oesopha- 
gus is of equal width in its distal half, but its proximal part forms 
a large oval bulb, in the interior of which is found a cavity, but 
no valvular apparatus. Tail short and conical. The vulva is found 
behind the middle of the body. A rudiment of the ovary is seen 
at some distance behind the vulva. It is to be supposed that the 
ovary is single and that the place of this and of the uterus is 
caudad to the vulva. 
Oistolaimus ferox n. sp. 
PI. I, figs. 2, 10, 11. 
Locality: Auckland Islands. North-arm of Carnley harbour. Clay. 
Length: 0,7 mm. a — 14,5. /S — 4,8. y = 9,5. 
In the material from the North-arm of Carnley harbour was 
found a single female, not fully sexually developed. Though the 
specimen was in no good condition I resolved to deal with it on 
account of the interesting and easily recognizable construction of 
its buccal cavity, and because it represented a genus, hitherto not 
described. 
