203 
Length of the animal.... 1,67 mm. 
Length of the ,,head" ... 180 2. 
Length of he Mil 2. 150 v. 
Greatest width of the body 180 v. 
Length of the ventral rods. 180 p. 
DRE RD 73 x 61 2. 
Bibliography. 
Claparéde: Beobachtungen tiiber Anatomie und Entwicklungsge- 
schichte wirbelloser Thiere, an der Kiste von Normandie angestellt. 1863. 
Metschnikoff: Beitråge zur Naturgeschichte der Wirmer. I. Chæ- 
tosoma und Rhabdogaster; Zeitschr. f. wiss. Zool. T. XVII 3 
Schepotieff: Zur Systematik der Nematoideen. Zoologischer An- 
zeiger. Bd. XXXI. 1907. 
— : Die Chætosomatiden; Zool. Jabrb., Abt. f. Syst. Bd. 26. 1908. 
Explanation of Plate I. 
Zeiss" Microscope was used. 
1. Chætosoma annulatum n. sp. 2 Obj. A 
2. Head, seen in optical section. Apochr. 2 mm CO4. 
3. Tail. Apochr. 2mm CO 4. 
4. Ventral rod. dere 2 mm CO 8. 
5. Anogenital region of the male; with spicules. Apochr. 2 mm C O 4. 
26.—2.—1915. 
