236 
de Man in the Dutch species, reaches a little way into the lumen 
of the intestine. The vulva is forming a broad transverse fissure; the 
female organ is single and extends forward in the animal. Uterus 
contains never more than one egg, which is very large and cylindri- 
form; in a female of the length of nearly 2 mm it measures 165” 
in length. The tail relatively a little longer than in the former 
described. species tapers evenly, ending with its apex rounded and 
a little dilated with a distinct duct for the caudal glands. 
All the specimens collected are females. 
Zeiss:Okularmikrom. Obj.. C. Oc. 2. 
Length 270 — 1,8 mm. 
Pharyngeal cavity: 8. 
Oesophagus 70. 
Vulva 160. 
Tail 20. 
Width 4. 
The formula of de Man gives: a = 67, 2=3, 7 = 1372. 
Diplogaster rivalis Leydig. 
1873. Bitsehli;-p 120; 7, XT. fr. 68: É 
1876. — p. 871. :T. XXIII. fig. 5-a——b; and XXIV. 
fig. 5.6; 
1884. De Man, p. 86. T. XII. fig, 50. 
1886. Orley, p. 42. 
It was taken at Ordrup Mose, behind Christiansholm, in a 
little pool filled with Conferves. I got both male and female, the 
latter with large and lively young. The species appears to have 
no wide distribution in this country. 
Diplogaster fietor Bastian. 
1865; Bastian, p; 116. PE X4 fig, 171178; 
1884. De: Man, ps 88, T, XIII. fig, 51; 
A male was taken at Lynæs, the length of which measures 
1,2 mm. 
