220 
the extremities. The cuticula is smooth, beset with long fine setæ. 
The lateral organ is large, circular and, when seen in profile, rather 
deep with a slight elevation in the centre; it is placed rather near 
the anterior end (fig. 22). The tail is rather short and contains 
three excretory giands debouching on its blunt rounded tip. The 
raouth is slightly cup-shaped and rather flat. Oesophagus increasing 
towards its proximal end, is liere only a little thicker than near 
the mouth. The giands on the limit between the intestine and 
the oesophagus are not very conspicuous. The intestine consisting 
of two rows of cells is rather dark-coloured and frequently contains 
Diatoms. The ovary stretches far forwards in the body-cavity; on 
the preparations it can be followed beyond the proximal end of 
the oesophagus but then it tapers and is lost, so that it is 
impossible exactly to indicate the limit. Unfortunately I have no 
observations in that respect from living specimens. The anus is 
situated about half-way between the vulva and the end of the tail, 
a little nearer the latter. The vulva is forming a broad transverse 
fissure and the vagina is placed vertically to the longitudinal 
axis of the animal, not parallel to the rectum as often is the case 
in this genus. The spicules of the male are very characteristic; 
they are bent in an obtuse angle and being thickest in the angle 
they have a dilatation proximal to this on the ventral side. The 
tip is curved slightly upwards and ends bluntly. The distal 
half is surrounded by a sheath-like apparatus, consisting of a very 
thin membrane provided with two pointed tips stretching backwards 
in the animal. 
Zeiss Ocularmikrom. Obj. 4. Oc. 2. 
5 Length 110 = 1,7 mm. c? Length 90 = 1,4 mm. 
Oesoph. 20. Oesoph. 19. 
Vulva 75. 
Anus 95. 
Tail 15. 
Width 8. 
Tail 13. 
Width 6. 
The formula of de Man gives 
( ?, « = 14, /? = 5 1 / 2 , y = 7. 
\ (?, CL = 15, ft = 5 , y = 7. 
