247 
three quarters ;of the oesophagus are thin,: from the beginning of 
the last fourth part it increases quickly. The vulva is placed a 
little before the middle of the body; the ante- and postvaginal part 
stand in the relation as 36 to 57. The tail is conical, pointed and 
its distal third is: ventrally bent,- forming a right angle. with the 
proximal pårt. The female organ is bifid, the ovaries are relatively 
small; the uterus being rather spacious appears to be able to contain 
a considerable number of eggs. The hind part of the body of the 
male is ventrally bent. The number of the papillæ is" nineteen, 
the hindmost is placed close before the anus, the space between 
the last four is twice the space between the others. . The spicules 
are short, thick and provided with two longitudinal lists; the 
proximal end of the former is globular and no accessory pieces are 
seen (fig. 40). 
The movements of the animal are exceedingly sluggish. 
Zeiss Okularmikrom. AA. 0 
Female: : Male: 
Length 372 — 6 mm. Length 287 — 4,6 mm. 
Oes. 24. £. 3 Oes. 22, 
Vulva 144. Tail 8. 
Tail 10. sr Wilk 3, 
Width 4. i j 
93; B=15!/2, y == 87, 
6, 2=13 7% 5r—36. 
f 
The formula of de Man gives ! ål 
z 
bå 
Dorylaimus stagnalis Dujardin. 
1845: Dujardin, pp 281 FT HE ARNE 
"1865, Bastian, p. 106, PI. TX, f2:9587 
1873. Bitschli, p. 27, T. I. fig. 4 a—d. 
1876. ag p. 379, T. XXV. fig. 13 a—c, 
1884. -De Man, p. 186, 7. XXXTI: fig. 182. 
HO 0 4 07 TH TE fø 
Ås might well be expected this species is: widely distributed 
in this country. It is not confined to the larger basins as. lakes 
