229 
It is kept bent inwards towards the vent forming a regular cir- 
cular arch. (fig. 10). The movements of the animal are very slow. 
After having written the above, the material in which the 
specimen dealt with was found has been re-examined and I 
sueceeded in finding one specimen more, unfortunately also an 
immature female being a little smaller than the individual which 
was found at first. It gives no further information. 
Zeiss" Okularmikrom. Obj. A; 00. 2; 
Length 247 — 4 mm. 
Oes. 62. 
Vulva 148. 
Tal 55; 
Width 6. 
The formula of de Man gives: 0—41, 2=4, 7 =4"/2. 
Oncholaimus thalassophygas de Man. 
1884; de Man,;slL-0: p/ 68 T; X fig 80. 
1889. de Man, po T.YL: fig 1 ac: 
There is not much to be said of the distribution of this 
species in this country; it is very common on Hellerup Strandeng. 
It occurs in pools that are by turns filled with water and dry. It 
was collected on the roots of Scirpus and Aster tripolium and among 
Conferves. Besides the named locality it has only been taken at 
Dragør near the ,,Badehotel", a place resembling that at Hellerup. 
The Danish specimens agree essentially with the specimens described 
by de Man from the isle of Walcheren. 
Oncholaimus viridis Bastian. 
1865: "Bastian, 1 0-9. 187, Ph.XL fig 197 and 188. 
Å form resembling the Oncholaimus viridis occurs abundantly 
at our coasts. The different proportions do not agree perfectly with 
what is known of this species. On the other side this is the only 
one of the species with a single ovary of this genus described by 
Bastian, to which it can be ranged with some reasonableness. I 
