BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 5. N:O 16. 17 
Synoptic table. 
A. The upper end of the penis-sheath furnished with a crown 
of star-like coneretions. 'The oviduct is single. 
L. ornatus n. sp. 
B. The upper end of the penis-sheath not furnished with 
star-like coneretions. The oviduct is double. 
1. The penis proper projecting outside the penis-sheath 
and there forming a globular head. 
DL. Steigerwaldi n. sp. 
2. The penis proper not ordinarily projecting ontside the 
penis-sheath, and its lower end not forming a glan- 
dular head. 
a. The lower end of the penis proper is truncate and 
somewhat wider. DL. monticola n. sp. 
b. The lower end of the penis proper is pointed and 
narrower. The lower end of the interior oviduct is 
- wider than its middle. DL. alpestris n. sp. 
ce. The lower end of the penis proper is pointed or 
rounded. The lower end of the interior oviduct is 
much narrower than its middle or upper part. 
LT. Silvant n. sp. 
L. ornatus n. sp. 
The cephalic ganglion is broadest behind and its two 
posterior lobes are well rounded and separated. 'The penis 
is long and slender, broadest at its upper end and from there 
gradually tapering towards the apex, which however is slightly 
swelled. The penis-sheath is long, cylindrical; widest at its 
lower orifice and narrowest at the midle. The upper end, 
near the entrance to the oviduct, is surrounded by a crown 
of star-like concretions probably of a chitinous consistence. 
The oviduct is single, sacklike, and longer than the penis- 
sheath. The receptacle is elongated and of a flask-like shape, 
sometimes narrower at the middle. 
The body of the worm is long and slender, not tapering, 
and its epidermis is tough. The length is about 30 m.m., 
the width about 0,6 m.m. 
Habitat: California, San Joaquim river; attached to de- 
caying wood floating on the surface of the water of a shallow 
pond. t 
2 
kh 
