Land, Fresh- Water, and Marine Crustacea. 139 



Family Trichoniscidj;. 

 Genus (22) Trichoniscus, Brandt, 1833. 



31. Trichoniscus pasillus, Brandt. 



1833. Trichoniscus pusilhis, Brandt, Conspect. Monogr. Crust. Onis- 



codorum, p. 12, pi. iv. fig. 9. 

 1891. Philougria riparia, T. Scott., Proc. Roy. Phys. Soc. Edin., 



vol. xi. p. 76. 



Habitat. — Under stones at St Margaret's Hope, Cramond 

 Island, Arthur's Seat, Largo, and other places; moderately 

 frequent. Generally distributed (W. Evans). 



32. Trichoniscus roseus (C. L. Koch). 



1838. Itea rosea, Koch, Deutschlands Crustaceen, p. 22, fig. 16. 

 1887. Philougria rosea, T. Scott, Trans. Nat. Hist. Soc. Glasg. , 

 vol. i. (N.S.)p. 373. 



Habitat. — Under stones at South Queensferry, 23rd March 



1901 (W. Evans, in Ann. Scot. Nat. Hist., April 1901); in 



garden, Morningside, September 1905 (Evans). Salisbury 



Crags, Edinburgh, July 1887 ; and Cramond Island, 18th 



April 1888. 1 These last two records were overlooked in the 



preparation of my paper on " The Land and Fresh- Water 



Crustacea of the District around Edinburgh," part i., published 



in Proc. Roy. Phys. Soc. PJdin., vol. xi. p. 73 et seq. 



Family Oniscidj;. 

 Genus (23) Oniscus, Linne, 1761. 

 33. Oniscus asellus, Linne. 



1761. Oniscus asellus, Linn., Fauna Suecica, vol. iv. p. 1.83J No. 

 2058; and Syst. Nat., ed. xii., vol. ii. p. 1061. 



Habitat. — Common everywhere, usually hiding under 

 stones, old wood, etc. O. fossor, Bate and Westw., is now 

 regarded as a form of 0. asellus. 



1 On the occasion of this visit to Cramond Island in April 1888, a friend 

 and I crossed over to it about 1 a.m. — just before the track was covered by 

 the rising tide — and we remained on the island till the tide ebbed and began 

 to flow again. The interval from the time that daylight made things visible 

 till we recrossed to the mainland, was spent in searching for natural history 

 objects, and especially for the smaller Crustacea, and with fairly satisfactory 

 results. 



