250 THE ZOOLOGIST. 



and other disguising materials in the Four-horned species (at 

 all events in those studied by me) are not spitted by the Crab 

 on the hooks, or roughly entangled in them, as seems to be often 

 imagined ; though it is possible that materials are sometimes 

 caught on the hooks of a passing Crab, and I have seen a flat 

 piece of the thin green Ulva lactuca really spitted on two of the 

 hairs of the leg of one individual. The hooks are not scattered 



Fig. 2. — Outline of the body and right limbs of an adult female Four-horned 

 Spider-Crab, mainly to show the tracts of hook-like hairs and the way in 

 which weed is thrust into two of the alleys. The other hairs are not shown. 



over the surface of the body but form regular tracts, whose 

 arrangement is shown in fig. 2. It will be seen that the hooks 

 of each tract tend to form " alleys," the hooks of opposite sides 

 of an alley generally facing inwards. The thin ends of the dis- 

 guising materials are, as a rule, thrust along the alleys made by 

 these opposed hooks, and if one of the Four-horned Spider-Crabs 

 be examined it will usually be found that the material can easily 

 be moved in and out of an alley. In the case of flat pieces of 

 seaweed which are too large to be thrust into an alley, one corner 

 of the weed is usually twisted round in a spill-like manner, and 

 the narrow piece so formed is thrust into the alley. The hooked 



