VARIOUS ORGANS OF ARACHNIDA. 



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 

 (probably Tegenaria civilis), show- 

 ing 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 Philo- 

 dromus 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 

 according to the age of the in- 

 dividual. In one species, for ex- 

 ample, 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 re- 

 presented in the engraving were taken from the Rock-scorpion, described and figured 

 on page 681. 



Eyes, Lyc6sa. 

 Eyes, Hersilii. 

 Falces, Sdlticus, 

 Foot, Lycosa. 



Eyes, Salticus. 

 Eyes, Walckenacra. 

 Falces, Argyronetra. 

 Foot, Sdlticus. 

 Combs Scorpion. 



Eyes, Nops. 

 Eyes, Dysdera. 

 Labium, Linyphia 

 Foot, Tegenaria 



