40 THE BRITISH WOODLICE. 
Family—ARMADILLIDIDE. 
Tail appendages not projecting when the animal 
is walking. 
Gents—ARMADILLIDIUM Brandt, 1833 (3), p. 184. 
Flagellum, with two joints ; outer division of the tail appendages 
expanded and broader at the hinder end. 
The members of the genus Armadillidium are more likely to 
be confounded, by the uninitiated, with the “ Pill-millipedes” 
than with other Woodlice. Excepting Cylisticus (which has 
long pointed tail appendages) no other British forms have the 
power of rolling themselves up into a complete ball. The 
very arched body is characteristic of Avmadillidium, and so is 
the groove into which the basal joints of the antenne fit when 
the creatures curl up. 
The first two abdominal appendages only are provided with 
air-tubes. 
Armadillidium nasatum  Budde-Lund. 
PLaTeE XXII. 
1885 Armadillidium nasatum Budde-Lund (8), p. 51. 
1892 Armadillidium nasatum Dolltus (14), p. 10, fig. 12. 
1899 Armadillidium nasatun: Norman (misprinted Porcellidiun.) 
(49), Pp. 57, pl. VI., figs. 5-S. 
Armadillidium nasatum has a narrow but very 
prominent frontal lobe, which is almost square 
and curves somewhat upwards and backwards. 
The joints of the flagellum are approximately 
equal, and are together of the same length as 
the last peduncular joint. 
The telson is as long as it is broad at the 
base, and tapers to a roundish point, while its 
sides are slightly incurved. 
FIG, 56.—FLAGELLUM The outer divisions of the tail appendages 
AND LAST PEDUNCULAR : 
JoINTOF THEANTENNA @Ye Considerably longer than broad, and are 
cr trmadtidtins  nOreiOr tess paddle-shaped. 
It will be noticed that the slope from thorax 
to telson is more gentle than in the common species, Avmadillidium 
vulgare, and the first thoracic segment is not so greatly developed. 
Consequently the species which we are considering does not 
produce a perfect sphere, and the antenne are not hidden when 
