8 
body. The female organs occupy a large Space in the body cavity. 
Vaginal giands, containing a coarsely granulated protoplasm, are 
present. 
As the other species of this genus, the species under consider- 
ation is of a voracious habit. In the hindmost part of the intestine 
of one of my specimens is seen the chitinous skeleton of the buc- 
cal cavity of an Oncholaimus ; the intestine of the other spec- 
imen includes the spicular apparatus of a Parasabatieria Mortenseni, 
a species described in this paper. Halichoanolaimus ovalis is evi¬ 
dently closely related to H. robustus Bastian and to H. longicauda 
Ditlevsen; the shape of the tail and the structure of the buccal 
cavity are mainly the same in these forms. 
Aræolaimus de Man. 
Avæolaimus spectabilis n. sp. 
PI. II, fig. 1. PI, III, figs. 3, 9. 
Locality: Auckland Islands. North-arm of Carnley harbour. Clay. 
Length: 1,6 mm. a — 40. 0 = 8. y == 20. 
Only one specimen was at my disposal, a female the length of 
which makes 1,6 mm. It seems to be rather closely related to the 
A. microphthalmus , described by de Man in 1893. Nevertheless I 
do not venture to refer it to this species, firstly because the tail 
of the species under consideration is considerably shorter than that 
of the species of de Man, and secondly on account of differences 
in the structure of the æsophagus. My species possesses just the 
„singulier élargissement elliptique“ which de Man found in his 
A. bioculatus from the Mediterranean but which in A. microphthal¬ 
mus „fait completement défaut“ (de Man 1. c. p. 7). On the other 
hånd it is not possible to refer the Auckland-species to de Man’s 
A. bioculatus, the lateral organs being entirely different in structure 
in the two species. Possibly it will prove suitable to separate 
from the genus Aræolaimus the two Mediterranean species of de 
Man on account of the divergent shape of their lateral organs. In 
these two species the lateral organ is circular, while in A. biocula¬ 
tus and in A. spectabilis it is loop-shaped. In his paper, dealing 
with the Nematodes from the Barentssea, Steiner called at¬ 
tention to the lateral organs of this genus in as much as he 
