lx PROCEEDINGS OF THE 
and Poduride. M. Nicolet has already divided the latter into 
three groups,—the Podurelles, containing the elongated forms ; the 
Smynthurelles, which correspond to the old genus Smynthurus ; 
and the Lipurelles, for the non-saltatorial species. These three 
groups Mr. Lubbock considers as three families, and it is to the 
second of the three that his present observations are confined. 
To the two genera of which it has hitherto consisted he adds a 
third, characterized by having the antenne four-jointed, without 
an elbow, and with a short terminal segment. The organs of 
respiration also are very different. Of this genus he describes 
two new species, as well as one of Smynthurus. 
Without going through the various opinions which have been 
held as to the composition of the mouth in the Poduride, it may 
be sufficient to mention that M. Nicolet, whose views have gene- 
rally been followed by succeeding writers, describes, first, a la- 
brum ; secondly, mandibles; thirdly, maxille ; fourthly, a labium. 
He found no palpi. Mr. Lubbock, however, describes a pair of 
small palpi, and also a pair of membranous organs which re- 
present perhaps the second pair of maxille. There is, more- 
over, another membranous body in front of the labium, which is 
equivalent, probably, to the langue vésiculeuse of the Lepismide. 
If this is to be considered as representing another pair of append- 
ages, it is evident that the mouth of the Thysanoura presents 
several interesting peculiarities in which it differs from that of 
other hexapod Articulata and makes an approach to other groups 
of the great Annulose series. Mr. Lubbock, however, hesitates to 
draw the conclusions which seem to him to follow from these facts, 
until he shall have been able to study the construction of the 
mouth in other allied families. 
The digestive organs consist of a narrow oesophagus, a capa- 
cious stomach, and a short rectum. The generative organs of the 
female consist of two egg-tubes, one on each side, communicating 
by a rather long vagina with the vulva, which opens with the 
anus at the posterior end of the body. The testes are formed 
on‘ the same type as the ovary; at their posterior extremity 
they expand into a somewhat triangular “receptacle,” two sides 
of which are accompanied by a glandular organ, the cavity of 
which is filled with minute granules. From each receptacle a 
short, narrow vas deferens leads into a somewhat pear-shaped 
ductus ejaculatorius, which opens in a papilla immediately in front 
of the anus. There appears to be no penis. 
In Smynthurus the spiracles are two in number, and open on 
