CRtrSTACEA. 519 



iEEO-SPIRANTIA. 



ONISCID^. 



Genus, Ligia. — Falricms. 



First antennae rudimentary, second long. Tail appendage 

 directed posteriorly, having two branches. 



Ligia oceanica. — Lin. Syst. Nat., ii, p. 1061. — Bate and Westivood, 

 p. 444. 

 This species is common on all our coasts, running with agility, 

 and when frightened simulating death. It does not live in water 

 but on the sea-shore, within reach of the spray. It feeds on de- 

 caying animal and vegetable substances. 



Genus, Philoscia. — Latrielle. 



Ovate, sub-depressed. First antennse rudimentary; second, 

 eight-pointed ; tail appendage with two unequal branches. 



Philoscia muscoeum. — Svoipelli, Entom. Carniol., p. 1145. — Bate 

 and Westwood, p. 480. 

 This species is widely distributed and very common, preferring 

 dry situations under leaves, stones, and moss, near the sea-shore. 



Philoscia couchii. — Kinahan, Nat. Hist. Rev., vol. v, 1858, p. 193, 

 pi. 23, Jiff. 4. — Bate and Westwood, p. 452. 

 This species runs with agility, but does not roll itself into a 

 ball. It was discovered at Talland Cove, near Polperro. Prof. 

 Kinahan, Trinity College, Dublin, and the writer, were returning 

 from paying a visit to Mr. Couch, when the former found it at 

 the margin of a high tide, mingled with Ligia oceanica, Porcellio 

 scaier, and Orchestia littorea. 



Genus, Philougria. — Kinahan. 



Like Philoscia, but with second antennae having nine or ten 

 joints. 



Philougei aeipaeia. — Koch, Beutsch Cmst., 22, 17. — Bate and 

 Westwood, p. 456. 



At Plymouth. At Polperro it is not uncommon in the garden 

 of the inn. At Looe it is abundant among sticks by the river 

 side. It is found in very moist j^laces amongst aU kinds of de- 

 caying matter. It runs with agility, and buries itself deep in 



