227 
Zeiss Okularmikrom. A. Oc. 2. 
Female. Male. 
Length 250 — 4 mm. Length 228 — 3,6 mm. 
Oesoph. 50. Oesoph. 46. 
Vulva 135. Tåil..5; 
Tail c. 8, Width 5. 
Width 8. 
For the female the formula of de Man gives: a = 31, 
2=5, r— 5. 
Mononchus brachyuris Bitschli. 
1873. Bitschli, p.77. T. III & IV. fig. 20 a—e. 
1884. de Man, p. 66, T. IX. fig. 37. 
This species has in Denmark about the same distribution as 
M. papillatus but it is decidedly more unconmmon. Hitherto I 
have not seen the male, which for the rest is known. The species 
is apparently fond of dampness like the other Mononchs. It was 
collected on the roots of Menyanthes trifoliata in a bog at 
Lynæs. Further it has been taken in the bog by ,,Vintapper- 
gaarden", near Lyngby. In Jutland it was collected in the boggy 
regions between ,,Hulsig" and ,,Kandestederne”, in a bog near the 
»Kandestederne" and on roots of plants at the bank of a pond 
between Nymindegab and Nørre-Nebel. 
Mononchus macrostoma Bastian. 
1865. Bastian, p. 101. Pl. IX, fig. 29—30. 
1884. de Man, p. 63. T. IX. fig. 34. 
Among all the Danish Mononchs this species has the widest 
distribution; it has been collected at nearly all the places where I 
have met with other species of the genus. It is one of the most 
common of all our freeliving Nematodes. On Sjælland it has been 
collected at the ,,Furesø", in the Ermelund, on roots of plants, 
in Lyngby Mose, Hellerup Strandeng, Ordrup Mose, at Lynæs in a 
bog near the plantation. Further it has been taken on the little 
15% 
