61 
hind the lateral organ. It is beyond doubt that this eye which con- 
sists of a cyathiform pigment heap has been lens-bearing as has 
presumably also been the case in S. gracilis in which the pigment- 
heap is of essentially the same shape. 
Oesophagus is of uniform width throughout its whole length. 
The nerve ring is rather indistinct and situated at the beginning 
of the proximal third of the oesophagus. The intestinal cells are 
crowded with large refringing granules. 
In 5. gracilis I have not succeeded in observing a ventral giand; 
but as this organ is present in S. pellucida it is probably not mis¬ 
sing in the former. In the species under consideration it is situ¬ 
ated some distance behind the base of the oesophagus and along- 
side the intestine. The excretory pore is found at about the level 
of the eye-spot, c. 25 g behind the front in the specimen at my 
disposal. 
The spicules are slightly curved and provided with an incon- 
spicuous dilatation in the proximal end, behind which is seén a 
necklike constriction. The accessory pieces are rather large and 
acute in their proximal end. Distally they are expanded and form 
a sheath which surrounds the the distal part of the spicules, not 
unlike what is found in certain species of Cyatholaimus no doubt 
a closely related genus. As in S. gracilis three small supplement- 
ary organs are seen, and cephalad to these a single, large supple- 
mentary organ. This latter is in the species under consideration 
large and almost straight, not curved as in S. gracilis. The dis¬ 
tance between two of the small supplementary organs makes c. 10 
g. The distance between the large supplementary organ and the 
most cephalad of the small organs makes c. 30 g, and the distance 
from the most caudad of the small supplementary organs to the 
anal aperture makes c. 25 g. 
a = 37,5. /S = 7,4. y — 25. 
Oncholaimus skawensis n. sp. 
PI. II, figs. 3, G. 
Among the Nematodes from the harbour of the Skaw was found 
a single male specimen of an Oncholaimus which I have not been 
able to refer to any known species. 
The shape is rather siender, almost filiform; the body is not 
