65 
Tvilobus grandipapillatus Brakenhoff. 
Last year in the month of July I secured a male of this form 
near Frederiksdal at the border of the lake of Furesø. It was taken 
in coarse sand on grass-roots about one m from the edge of the 
water. It is a rather small specimen but fully sexually developed. 
In preserved condition it has rolied up the foremost part of the 
body leaving only the hind-part with the papillæ and the tail 
stretched out. On account of this faet I have not been able to meas- 
ure with any certainty the length of the animal; I estimate it to 
about 1,8 mm. On the other side it was easy to measure the lengh 
of the tail and the distances between the papillæ. The length of 
the tail makes 160 p. 
From the anal aperture to the first (hindmost) papilla 48 p. 
— 
first papilla 
— second 
39 
— 
second — 
— third 
— 54 
— 
third — 
— fourth 
— 39 
— 
fourth — 
— fifth 
— 39 
— 
fifth — 
— sixth 
33 
Compared with the measurements of B r a k e n h o f f and M i c o- 
letzky, who found the species under consideration in the East- 
Alps and in Bukowina, it is worth noticing that there is relatively 
not so great a distance between the second and third papilla in 
the Danish specimen as in the above mentioned. The specimen 
from Germany taken by Brakenhoff seems in this respect to 
agree with the East-European form, taken by Micoletzky. An- 
other feature which is common to the Eastern and German forms 
but which does not hold good for the Danish specimen is the faet, 
that the foremost papilla is mueh smaller than the other ones. In 
the Danish specimen all six papillæ are of about the same size, 
c. 15 p. Brakenhoff indicates 24 p as average size for the four 
papillæ save the hindmost and the foremost. It may appear that 
this is very mueh compared with the dimensions of the papillæ in 
the specimen from Frederiksdal, but it must be remembered that 
the German specimen in length makes 2,5 mm, the Danish only 
c. 1 , 3 . Micoletzky indicates a size which is Vs — Vs ,5 of the 
body-width; in the Danish specimen the same proportion makes 
Vidensk. Medd. fra Dansk naturh. Foren. Bd. 74. 
5 
