MR. LUBBOCK ON THE THYSANURA. 593 
The labrum is somewhat broader at the base than at the free extremity, which ends 
in three not very well-marked lobes on each side ; there is also a curved row of teeth, 
which, however, do not meet in the middle, nor project beyond the edge. 
The mandibles (PI. LIX. fig. 6) are powerful, and have respectively four and five teeth, 
which are strong, though not very sharp. In general form, and in the position and 
arrangement of the molar surface, they are formed on the type common to the Po- 
duridce. 
The maxilla3 also resemble in general outline those of the allied species. At their 
extremity is a row of five processes. The three outer ones have the form of strong teeth ; 
the two inner ones are pointed, tongue-shaped processes, serrated on their inner margin. 
At the side of these are two other lobes : one of these is long, narrow, pointed, and 
generally lies, as it were, across the top of the organ ; it is serrated at its free extre- 
mity on the inner edge. The other lobe is large, and ends in a tooth pointing inwards ; 
the outer border is arched, the inner straight. It is, however, by no means easy to 
make out these different processes in a satisfactory manner. 
The appendage, which for the present I will call the palpus, is quadrate, but rounded 
off at the angles, and tapers slightly towards the apex. The apical margin is somewhat 
concave. The palpus has on one side a small process, which terminates in a stout bristle. 
At the base of the process is another stout seta, in addition to which the organ bears 
three smaller hairs. 
The second pair of maxiUse are membranous, have the apical margin excavated, with 
a tooth at the inner angle. 
The eyes are arranged as usual in the genus, and are pretty even in size. The an- 
tenna, which is inserted just in front of the " quadrilateral," must somewhat, obstruct 
the field of view . 
The foot (PI. LIX. fig. 5) of the anterior leg possesses, as usual, a tenent hair and 
two strong claws. The larger claw has a strong spine on the outer margin near the 
base, and two smaller ones on the inner margin, which are situated at almost equal 
distances from one another and from the two extremities. Near the tip is sometimes 
an indication of the third spine which we find in O. cincta. 
The small claw is lanceolate and simple. Near the base, however, and on the inner 
margin, is the rudiment of a tooth ; but in many cases it is very difficult to perceive. 
All the three legs are alike, so far as the constitution of the foot is concerned. 
The caudal appendages end in a claw (PI. LIX. fig. 7), which is curved downwards 
and has on the under surface a strong tooth. To see this properly, however, the organ 
must be seen from the side. 
In this species I have found Gregarinas. They were of two forms, either round 
elliptic. 
The latter appeared to be generally, if not always, united in pairs 
Degeeria. 
Degeeria nigromaculata (Fodura nigromaeulata, Temp.)- Body fusiform, pale greenish 
yellow or stone-colour. Head rounded, with a black fascia anteriorly, including 
the eyes. The posterior ends of the second, fourth, and fifth segments with a 
4K.2 
