INDEX OF SCIENTIFIC TERMS 221 



Carapace — covering of anterior upper surface in arthropods 71 



Carina — lateral keel-like projection from the body segments of some 

 millipedes 18 



Cavernicolous — cave-dwel ling 



Cephalothorax — fore part of the body of an Arachnid, corresponding to 

 the head and thorax of an insect; more properly called the prosoma (q.v.) 



Chelate — pincer-like, as the claw of a lobster. The last segment of a limb 

 apposed to that preceding it so that the appendage is adapted for grasp- 

 ing 



Chelicerae — jaws of an Arachnid; carrying the poison fangs in spiders 



Chiggers — parasitic larvae of Thrombiculid mites 1 84, 191 



Chitin — nitrogenous polysaccharide forming the basic material of the 

 integument or cuticle in the Arthropoda. Usually hardened by impreg- 

 nation with calcium or sclerotin (q.v.) 



Chiton — a mollusc that clings to rocks on the sea-shore 21 



Chordotonal organs — integumental sensillae with auditory or pro- 

 preoceptive function 138 



Chromatophore — colour pigment cell 6 



Cleidoic egg — one containing enough water for development and en- 

 closed in a comparatively impermeable membrane or shell 206 



Clavate — club-shaped 



Clypeus — narrow strip of prosoma between the eyes and bases of the 

 chelicerae in spiders 



Collum — first post-cephalic segment of myriapods 64 



Commensal — an animal living in a loose association with another and 

 from which only one partner derives benefit 30, 103, 185 



Compound eye — eye composed of numerous visual elements, found in 

 many of the arthropods 40 



Coxa — first segment of the limb attaching it to the body 



Cribellum — sieve-hke plate in front of the spinnerets in some spiders 

 151,157,161 



Cryptic coloration — colour pattern making for inconspicuousness. Cf. 

 Aposematic (q.v.) 133, 141, 152, 163, 170 



Cucullus — mobile hood at front edge of carapace of Ricinulei 1 29 



Cuticle — hardened integument of arthropods 



Dermal light sense — appreciation of light stimuli through the integu- 

 ment 22 



Deutogyne — secondary female Eriophyid mite dififering from the primo- 

 gyne or primary type and having no male counterpart 200, 201 



Deutonymph — second nymphal stage following the larval instar of a 

 mite or false-scorpion 112,197 



Diapause — dormant state usually characterised by temporary failure of 

 growth or reproduction, by reduced metabolism and often by enhanced 

 resistance to climatic factors such as cold, heat or drought 199-201 



