PROCEEDINGS OF SOCIETIES. 79 
and of legs, then we must expect to find that the links by which 
we shall eventually be able to connect not only the two great 
orders of centipedes together, but also the Myriapods, as a whole 
with the other classes of articulata, will possess a small number 
of appendages. The Scutigeride do not constitute such a group; 
but Pauropus apparently does. 
The differences between Pawropus and the known Chilopods 
and Diplopods are then indicated. 
From the former the new genus differs chiefly in the antennz 
having only five segments; in the absence of the powerful second 
pair of foot-jaws, and in the circumstance that the generative 
oe are probably situated in the anterior part of the 
ody. 
From the Diplopod or Chilognathous group it differs in the 
pairs of legs being all equidistant and placed in distinct pairs. 
Moreover in all Diplopods the first three pairs of legs are dis- 
tinguished from the rest by being attached to a single apparent 
segment, whereas in Pawropus this is only the case with the first 
pair. Again, in all Diplopods the legs are equal in size, or if 
there be any difference the posterior pairs are rather smaller than 
the others, whilst in Pawropus they are decidedly longer. In all 
Diplopods, again, the feet terminate in simple claws, which is not 
the case in Pauropus. The mouth-parts, though very different from 
those of the Chilopods, appear to resemble those of that group 
in a rudimentary condition rather than those of the Diplopods. 
Lastly, the eyes and antenne are very unlike those of any 
Diplopod, or in fact of all known Myriapods, the latter re- 
minding us strongly of the types presented in the antennz of certain 
crustacea. 
The above notice will suffice to show that Pauwropus is a most 
interesting subject of inquiry, and as it is one from its minute 
size and delicate structure eminently requiring skilful micro- 
scopical investigation, we have thought the space here devoted to 
it well bestowed. 
Dustin Microscopitcat Ciur. 
July 19th, 1866. 
Mr. W. Archer took occasion to exhibit for the first time to the 
Club, and, as definitely identified indeed, he thought, new to Britain, 
Cdogonium rostellatum (Pringsh.). Thisis one of several mone- 
cious species; but it is also characterised by the oogonium not 
opening by a pore, or aperture formed in its wall, for the admis- 
sion of the spermatozoids, as is usual in this genus, and the only 
mode in Bulbochete, but by a circumscissile dehiscence. From 
the cleft so produced an inner membrane projects, which seems 
to be itself perforate. These specimens occurred in considerable 
