THE BRITISH WOODLICE. 41 
it rolls up. It isinteresting to compare this species with Cylisticus 
convexus. The surface of the body is smooth, and its colour is a 
delicate brownish grey with more or less distinct rows of darker 
markings. 
BRITISH LOCALITIES : - 
England: Maldon; (W.M.W. from R.M.): Bluebell Hill, 
Maidstone (W.M.W.); Clifton, banks of the Avon; (W.M.W. 
from J.T.C. rg00) : Leigh Woods, Clifton; Tunbridge Wells ; 
South Devon ; (Stebbing in 49); Cheddar Cliffs, Somerset ; 
(Norman, 49). 
FOREIGN DISTRIBUTION :— 
Europe: France ; (28) : Spain; (12): Italy ; (23). 
Armadillidium vulgare Latreille. PLrare XXIII. 
1804. Armadillo vulgaris Latreille (37), p. 48. 
1804 Armadillo variegatus Latreille (37). 
1853 Armadiilo ater Schnitzler (65), p. 48. 
1816 Armadillo maculatus Risso (56), p. 158. 
1818 Armadillo pillularis Say (62), p. 432. 
1825 Armadillo pustulosus Dermarest (11), p. 323, pl. XLIX, 
1830-4 Armadillidium commutatum Brandt and Ratzeburg (4), p. 81, pl. 
Xill., fig, 123. 
1833 Armadillidium zenckeri Brandt (3), p. 185. 
1839 Armadillo trivialis Koch (34), part 28, pl. XIV. 
1898 Armadillidium vulgare Sars (59), p. 189, pl. LXXXII. 
The common pill woodlouse is Armadillidium vulgare. Its 
frontal lobe is not large, though it is broad, while its margin 
where it joins the head is rounded and slightly 
recurved. The proximal joint of the flagellum 
is somewhat the shorter and the two together, 
as in Avmadillidium nasatum, are of about the 
same length as the last joint of the peduncle. 
The telson has the form of a triangle with 
the angles truncated and is about as long as it 
is broad at the base. The outer divisions of 
the tail appendages are considerably broader 
than they are long. 
The species can roll itself up into a very 
perfect sphere, and when it assumes this form 
its antenne are hidden beneath the much 
expanded lateral plates of the first thoracic 
segment, FIG. 57.—FLAGELLUM 
5 . AND LAST PEDUNCULAR 
The body is smooth, shiny, and strongly joiwror tHe ANTENNA 
: ene Anne 
arched. Its colour varies very considerably, sr notechcaai 
generally it is of a slaty-grey, but yellow mark- 
ings are often present to a greater or less extent. In a specimen 
before us (from Bluebell Hill, Maidstone) the head is of a 
