102 



THE BRITISH W00DLICE. 



Family— ARMADILL.IDUD JE. 



Tail appendages not projecting when the animal 

 is walking. 



Genus— 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 Armadillidium, and so is 

 the groove into which the basal joints of the antennae fit when 

 the creatures curl up. 



The first two abdominal appendages only are provided with 

 air-tubes. 



Armadillidium nasatum Budde-Lund, 

 1885. Plate XXII: 



1885 A rmadillidiiim nasatum Budde-Lund (8), p. 51. 

 1892 Armadillidium nasatum Dolltus (14), p. 10, fig. 12. 

 1899 Armadillidium nasatum Norman (misprinted Porcdlidium) 

 <49>> P. 57, pi. VI., figs. 5-8. 



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. 



The outer divisions of the tail appendages 

 are considerably longer than broad, and are 

 more or less paddle-shaped. 



It will be noticed that the slope from thorax 

 to telson is more gentle than in the common species, A rmadillidiiim 

 vulgave, 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 antennae are not hidden when 



FIG. 56. — FLAGELLUM 

 AND LAST PEDUNCULAR 

 JOINT OF THE ANTENNA 



of Armadillidium 



nasatum. 



