88 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



Habitat. — Dredged off north side of the Clach rock,. 

 Cumbrae, in 6 fathoms, sea-weed, sand, and gravel. 

 Plymouth, Leach ; Falmouth, Mr. John Cranch ;. 

 Belfast Bay. 



Genus Njssa, Leach. 



N^ESA BIDENTATA, Adams. 



Oniscus bidentatus, Adams, Trans. Linn. Soc, vol. v.,. 

 p. 8, t. 2, f. 3, 4. 



Nozsa bidentata, Leach, Diet. Sci. Nat., xii., p. 341. 



Habitat. — Taken between tide-mark in holes and 

 crevices of stones, Portloy, Cumbrae. South-west 

 coast of England, Leach ; Polperro, Cornwall, Mr. J. 

 Cranch; in various localities, Ireland, Dr. Kinahan, 

 Professor J. R. Greene, and Mr. W. M'Calla ; rocky 

 stones of South Wales, South Devon, and Cornwall. 



Family ONISCID^J. 



Sub-family LIGIIN^J. 



Genus Ligia, Fabricius. 



ligia oceanica, Linne. 



Oniscus oceanicus, Linne, Sys. Nat., ii., p. 1061. 



Ligia oceanica, Fabricius, Ent. Sys. Suppl., p. 301. 



Oniscus aquaticus, Baxter, Opusc. Subs., ii., t. 13, f. 4. 



Var. Ligia scopulorum, Leach, Edin. Enc, vii., p. 406. 



Habitat. — Common all along our . coast between 

 tide - mark, generally at and above high - water, 

 running on the dry rocks or concealed under decay- 

 ing sea- weed, and often occurring in large numbers 

 crowded under damp stones. I have taken the young 

 on stones at low- water. 



Although they are fitted to run about for a time 

 in the open air, and even to bask on the rocks in 

 sunshine, where I have seen them, yet most of their 

 time seems to be spent under damp stones. As the 

 young are found at low-water, they at least are 

 capable of passing the greater part of their time 

 in a state of submersion. 



