268 MANUAL OF NATURAL HISTORY. 



7. FAMILY. True-Millipedes (Julidse). Body elon- 



gate, cylindrical, smooth, crustaceous, rolling 

 up spirally ; segments formed of three im- 

 bricated parts with simple margins ; antennae 

 short, sub-moniliform, a little thicker towards 

 the tips, 7-jointed ; mandibles two, horny, 

 truncato-dentate at the apex ; palpi none ; 

 lip flattened, with the upper margin crenate. 



8. FAMILY. False-Millipedes (Polydesmidae) Body 



depressed or sub-cylindric, rolling up spirally; 

 segments formed of a single piece with di- 

 lated margins ; antennae slender ; mouth as 

 in Julus. 



II. ORDER. FRINGE-TAILS (Thysamira). 

 Eyes compound, granular ; mandibles for dividing 

 the food ; sometimes jaws and distinct palpi ; feet 

 six, and other motive organs either on the sides of 

 abdomen, or at its extremity. Free. 



1. FAMILY. Sugar-Lice (Lepismatidae). Antennae 



many-jointed ; palpi distinct, exserted ; ab- 

 domen with moveable appendages on each 

 side of lower part, and with jointed filaments 

 at the extremity. 



2. FAMILY. Spring-Tails (Poduridae). Antennae 



4-jointed ; no distinct palpi ; abdomen with- 

 out lateral scales, ending in a forked caudal 

 appendage folded under the body when at 

 rest. 



III. ORDER. PARASITES (Anophira). 

 Eyes smooth, simple ; legs six ; body not scaly ; 



