11 
to one of these forms in particular — and to that alone. I, there¬ 
fore, have resigned as to the further denomination of these forms, 
hoping thus to have secured a more solid base for my species than 
is generally the case in the present literature. 
Description of the Fauna. 
Odonata. 
A fine impression of parts of wings and abdomen of an Agrionid 
has been found in cement-stone at Struer. Of the abdomen the 6 
outermost segments with anal appendages are present; on the 2 most 
completely preserved wings the basal half (from Nodus inwards) is 
wanting, but also their hind margin is somewhat molested; as for 
the rest they are fine and well preserved, this also applies to a small 
rest of a third wing. 
From a comparison with the literature, especially with the paper 
of Calvert *) it becomes evident that the wing impression must be 
due to a representative of the genus Phenacolestes Cock., formerly only 
known from the Miocene of Colorado. As the basal parts of the 
wings are missing, the number of the antenodal veins, the position 
of Arculus and Nodus in proportion to the length of the wing, and 
the shape of the quadrangle cannot be stated, but the following 
characters prove the specimen in question to belong to the genus 
Phenacolestes: Between Mi and Mia there is only one row of cells 
reaching to the margin of the wing, between Ma and Rs there is 
proximally one row, further on 2 rows, and at the margin 3, this is 
also the case with the area between Rs and M 3 ; also between M 4 
and Cui there are more (at least 4) rows of cells at the margin. 
Dysagrion, the only Odonat genus previously known from the 
Eocene period, differs from the above named form among other things 
by having up to 5 cell rows between Mia and M 2 , and up to 8 
between Rs and M3. 
Phenacolestes jutlandica n. sp. 
It is characteristic to this species (in contradistinction to the 
previously known Miocene species mirandus Cock, and parallelus 
Cock.) that between Mia and M 2 there are only 2 cell rows distally, 
and posterior to Cue likewise only 2 cell rows. Length of stigma 
*) Philip P. Calvert: The Fossil Odonate Phenacolestes, with a Discussion 
of the Venation of the Legion Podagrion Selys. Proc. Acad. Nat. Sei. 
Philadelphia 1913 p. 223-272, pi. XIV. 
