GUIDE 
TO THE 
CRUSTACEA, ARACHNIDA, 
ONYCHOPHORA AND MYRIOPODA. 
The specimens exhibited in the “ Insect ” gallery belong to the 
comprehensive group Arthropoda, of which the animals usually 
known as Insects form only one of the divisions. 
The Arthropoda may be defined as animals in which the body 
is more or less distinctly segmented, generally with a firm external 
skeleton, and with jointed limbs, some of which are modified to 
serve as jaws. 
The group is divided, according to the system of classification 
followed in arranging the gallery, into six Classes : — 
Class 1. — Crustacea (Crabs, Lobsters, etc.). 
,, 2. — Trilobita. 
,, 3. — Arachnida (Spiders, Scorpions, etc., with 
Appendix, Pentastomida). 
,, 4. — Onychophora (Peripatus). 
,, 5. — Diplopoda (Millipedes). 
,, 6. — Pauropoda. 
,, 7. — Symphyla. 
,, 8. — Chilopoda (Centipedes). 
,, 9.— Insecta (Moths, Plies, Beetles, etc.). 
The Insecta are arranged in the northern half of the Gallery, 
and are described in a separate Guide. The remaining classes 
occupy the southern half of the Gallery, and are dealt with here 
in the order given above. 
^ Myriopoda. 
