VARIOUS ORGANS OF ARACHNIDA. 



687 



particular genus afforded the subject, but the drawing corresponds closely with the 

 mandibles of Linyphia. The central figure shows the maxillae and falces of the Water- 

 spider (Argyronetra\ and the left-hand figure exhibits the same organs of the Hunting 

 Spider. 



The next three figures relate to 

 the feet and legs. The right-hand 

 sketch represents the foot and 

 tooth-claws of a Tegenaria (prob- 

 ably Tfgendria civilis), showing 

 the two large comb-like upper 

 claws, and the single little claw- 

 below, toothed only at its base. 

 The central figure represents the 

 end of the foot of a Hunting 

 Spider. It is worthy of notice that 

 the feet of the genera Philodromus 

 and Sparassus are formed in a like 

 manner. The left-hand figure 

 shows the foot of one of the Wolf 

 Spiders (Lycosa). 



The last object is the strange 

 double comb of the scorpion. 

 This wonderful organ is situated 

 on the first ring of the abdomen, 

 and no one knows its real use. 

 It consists, as may be seen, of a 

 pair of stout projections, jointed 

 at their base to the abdomen, and 

 furnished with a number of little 

 tooth-like appendages. The con- 

 sistence of this organ is rather 

 tough, thick, and somewhat parch- 

 ment-like ; it can be raised but 

 slightly from the abdomen, but 

 plays easily backwards and for- 

 wards by means of its joint. The 

 number of teeth belonging to. the 

 combs is extremely variable in the 

 different species, as it may be that 

 even the same species varies ac- 

 cording to the age of theindividual. 

 In one species, for example, no 

 more than thirteen teeth have been 

 counted in each comb, while in 

 others the teeth are about thirty 

 in number, and in a few species 

 even amount to fifty or sixty. The 

 combs that are represented in the 

 engraving were taken from the Rock-scorpion, described and figured on page 68 1. 



Eyes, Lycdsa. 

 Eyes, Hersilia. 

 Falces, Salticus. 

 Foot, Lycosa. 



Eyes, Salticus. 

 Eyes, Ufalckenaera. 

 Falces, Argyronetra. 

 Foot, Sdlticus. 

 Combs, Scorpion. 



Eyes Nops. 

 Eyes. Dysdera. 

 Labium, Linyphia- 

 Foot, Tegen&ria. 



