THE BRITISH WOODLICE. 19 
British Species.—Naturalists in this country paid little ° 
attention to the recognition or description of Woodlice, until 
the latter half of the nineteenth century. 
In 1857 Kinahan read a paper before the British Association 
(32) in which he described fourteen species of woodlice from the 
British Islands, and eleven years Jater when Bate and Westwood 
published their book (1), the number had risen to seventeen. 
One of the species (Oniscus fossor), however, was doubtful, and 
although Dr. Scharff in 1894 (63) rejected it, his list contained 
also seventeen species, for in the meantime the Rev. T. R. R. 
Stebbing had found Ligidium hypnovum in Surrey (70). 
Since then the Rev. Canon Norman, Dr. Scharff, the Rev. 
T. R. R. Stebbing, and one of the present writers, have added 
other species, as will be seen from the following pages, in which 
all those found, up to the present time in the British Islands 
are described and figured, 
We shall now consider in detail the British genera and 
species of woodlice and give their synonymy and distribution. 
Order—ISOPODA, 
Tribke—ONISCOIDA. 
Section—LIGIA. 
THE TWO DIVISIONS OF THE TAIL APPENDAGES ALIKE IN SHAPE. 
Fanuly—LIGIUD&. 
Flagellum with ten or more joints; tail appendages 
wholly visible; head without lateral lobes. 
Genus—LIGIA Fabricius, 1798 (27), p. 301. 
Abdomen broad ; body large; habitat, the sea-shore. 
The genus Ligia agrees with Ligidium alone, in that the 
flagellum of the larger antenne has more than ten joints. In 
both genera, there are no lateral lobes to the head, and the tail 
appendages are wholly visible from the upper surface of the 
body. The latter in Ligia is, however, very many times bigger 
than in Ligidium and shows no abrupt decrease in the width of 
its segments when the abdomen is reached. 
