PULMONAKIJE. 
293 
she adds a certain number of layers Finally, when the nuptial 
season has arrived, she lines an apartment with a softer and more 
downy material which is to enclose the sac of eggs and young 
ones. Although the exterior shell is more or less soiled by foreign 
bodies which serve to conceal it, the chamber of the industrious 
architect is always extremely neat and clean. There are four, 
five, or six egg pouches or sacculi in each domicil ; tliey are len- 
ticular, more than four lines in diameter, and formed of a snow- 
white taffeta lined Avith the softest down. The ova are not pro- 
duced till the latter end of December or the beginning of 
January; the young are to be protected from the rigour of 
winter and the incursions of enemies — all is prepared ; the recep- 
tacle of this precious deposit is separated from the web that 
adheres to the stone by soft down, and from the external calotte 
by the various layers I have mentioned. Some of the emar- 
ginations in the edge of the pavilion are completely closed by 
the continuity of the web, the edges of the remainder are merely 
laid on each other, so that by raising them up, the animal can 
issue from its tent or enter it, at pleasure. When the Uroctea 
leaves her habitation for the chase, she has nothing to fear, she 
only possesses the secret of the impenetrable emargination, and 
has the key to those which alone afford an entrance. When her 
offspring ai’e able to provide for themselves, they leave their 
native dwelling, to establish elsewhere their individual habita- 
tions, while the mother returns to it and dies — it is thus her 
cradle and her tomb.” 
Drassus, Walck. 
The Drassi differ from Clotho in several characters. Their che- 
licerse are robust, projecting and dentated beneath ; their jaws are 
obliquely truncated at the extremity, and the ligula forms an infe- 
riorly truncated oval, or an elongated curvilinear triangle ; the eyes 
are nearer to the anterior margin of the thorax, and the line formed 
by the four posterior ones is longer than the anterior, or extends 
beyond it on the sides. There is but little difference in the propor- 
tions of the fusi, and we do not observe between them the two pecti- 
niform valves peculiar to Clotho. Finally, the fourth pair of legs, 
and then the first, are manifestly longer than the others. Tlie Tibite 
and first joint of the tarsi are armed with spines. 
These Spiders live under stones, in the fissures ot walls, and on 
leaves ; they construct their cells with an extremely fine white silk. 
The cocoons of some are orbicular and flattened, and consist of two 
valves laid one on the other. M. Walckenaer distributes the Drassi 
into three families, according to the direction and approximation of 
the lines formed by the eyes, and the greater or less dilatation of the 
middle of the jaws. 
The species which he CB-Wsviridissiinus, Hist, des Aran.fascic. 
IV, 9, and which alone composes his third division, Aveaves a 
fine, Avhite, transparent Aveb on the surface of a leaf ; under this 
Aveb it seeks for shelter. I haAm sometimes obserAmd a similar 
Aveb on the leaf of the Pear-tree, but the margin Avas angular 
