229 
It is kept bent inwards towards the vent forming a regular cir- 
eular arch. (fig. 10). The movements of the animal are very slow. 
Aftei having written the above, the material in which the 
specimen dealt with was found has been re-examined and I 
succeeded in finding one specimen more, unfortunately also an 
i mm ature female being a little smaller than the individual which 
was found at first. It gives no further information. 
Zeiss’ O kularm i krom. Obj. A. O c. 2. 
Length 247 = 4 mm. 
Oes. 62. 
Vulva 148. 
Tail 55. 
Width 6. 
The formula of de Man gives: a — 41, — 4, y — i 1 ! 2 . 
Oncholaimus thalassophygas de Man. 
1884. de Man, 1. c. p. 68. T. X. fig. 89. 
1889. de Man, p. 1. T. VI. fig. 1 a—c. 
There is not much to bo said of the distribution of this 
species in this country; it is very common on Hellerup Strandeng. 
It occuis in pools that are by turns filled with water and dry. It 
was collected on the roots of Scirpus and Aster tripolfum and among 
Conferves. Besides the named locality it has only been taken at 
Dragør near the „Badehotel 11 , 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. c. p. 137. PI. XI. fig. 137 and 138. 
A 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 
