THE LIGID® 421 
In the five pairs of pleopods the outer branch is opercular, 
the inner branchial, but sexual in the first two pairs of the 
male. ‘The uropods are produced beyond the apex of the 
pleon. The young are said to quit the mother with only 
six pairs of trunk-feet. The famity contains seven or 
eight genera. 
Tngia, Fabricius, 1798, has a multiarticulate flagellum 
to the second antenna, the maxillipeds with a small 
rounded epipod, and the ‘ palp ’ four- to five-jointed. The 
uropods have two equal, stiliform, often filiform, branches. 
Ingia oceanica (Linn.) is found on rocky shores of Great 
Britain and in many parts of northern and western 
Europe. The uropods are not unhke these of Asellus 
aquaticus. It attains a length of more than an inch, 
without including uropods and antenne. In Ligia exotica, 
Roux, the second antenne are longer than the animal, the 
flagellum having from twenty-seven to forty-one joints. 
Ingia cursor, Dana, from Valparaiso, hints by its specific 
name at what is rather a character of the genus, rapidity 
of running. Von Siebold says that in Japan on rocky 
shores at ebb-tide in summer the Ligiz are sometimes so 
abundant that the fishermen sweep them with brooms 
into pots, to be used for bait. Budde-Lund in 1885 de- 
scribes in all twelve species from the shores of various parts 
of the world, and gives the names of five others. Ligia 
dilatata, Perty, he renames in 1879, Stymphdlus dilatatus, 
and he includes Dana’s Styloniscus, with its three species, 
in this family. 
Ingidium, Brandt, 1853, has a multiarticulate flagellum 
to the second antennz, the ‘palp’ of the maxillipeds 
conical, five-joiated, the stem of the uropods obliquely 
produced on the inner side, and the inner branch tipped 
with two hairs. Jive species have been described. Liqi- 
dium hypnorum (Cuvier, 1792) has had several names. 
In England it has hitherto only been recorded from the 
borders of Surrey and Sussex. Budde-Lund supposes 
that the Bavarian species Zia paludicéla, Koch, and Zia 
melanocephala, Koch, belong to this genus. 
Trichoniscus, Brandt, 1833, has the flagellum of the 
