328 



ARACHNOIDEA. 



CASE picinus), Proctophyllodes (type D. glandarinus), and Pterodectes, 

 but the characters are still to follow. He found that the males 

 pass through four, and the females through five stages — the egg, 

 the hexapod larva, the octopod larva or nymph without sexual 

 organs, sexual males or females without external sexual organs, 

 and sexual and fecundated females. These two last stages explain 

 the meaning of a fact, that had been previously observed, that in 

 Dermaleichus there were two forms of females. There is very 

 considerable difference in form between the sexes, the male 

 being the largest, and often being provided with monstrous and 

 exaggerated limbs, especially the third pair. There is also much 

 difference between some of the species, although others are very 

 close to each other. Some idea of these differences may be 

 gathered from the species that we have represented in the case, 

 and from the accompanying woodcuts. 



Dermaleichus bifidus {Buckhoh, loc. cit.) 



a„/. 



Dermaleichus bifidus ( nale). 

 Copied from Buckhclz. 



Ditto (female). 



Nos. Dermaleichus, S_p. From the rook.— 18. Magnified sketch of male 

 *^' '> Ditto of female. 



19 



