ORDER PULMONARLE. 
407 
robust, projecting, and denticulated underneath; their jaws 
are truncated obliquely at their extremity, and the tongue 
forms an oval, truncated inferiorly, or an elongated curvilinear 
triangle ; the eyes are more approximated to the anterior 
edge of the thorax, and the line formed by the four posterior 
is longer than the anterior, or extends beyond it on the sides. 
The proportions of the external spinnerets differ but little, 
and we do not see, between them those two pectiniform 
valves which are proper to the clothos. Finally, the fourth 
feet, and next the first two, are very manifestly longer than 
the others. The legs, and the first articulation of the tarsi, 
are armed with prickles. 
These aranei'des remain under stones, in the clefts of walls, 
and the interior of leaves, and there fabricate cells of a very 
white silk. The cocoons of some are orbicular, flatted, and com- 
posed of two valves applied one upon the other. M. Walcke- 
naer 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 names viridissimus , (Hist, des Aran, 
fasc. iv. 9.) and which alone composes his third division, 
constructs on the surface of leaves a fine, white, and trans- 
parent web, beneath which it establishes itself. One of the 
sides of the leaves of the pear-tree has sometimes presented 
to my observation a similar web, but angular at the sides, in 
the form of a tent, like that made by Clotho, and under which 
was the cocoon. It is, I presume, the work of this species of 
Drassus, and indicates the analogy of this subgenus with the 
preceding. M. Leon Dufour has given us, in the Annals of 
the Physical Sciences {Drassus segestriformis , VI. xcv. 1.) a 
very complete description of a species of Drassus, which he 
found under stones in the high mountains of the Pyrenees, 
and never below the Alpine Zone. It is one of the largest 
