134 Proceedings of the Royal Physical Society. 



Family Sph^romida 

 Genus (9) Sphaeroma, Latreille, 1802. 



12. Sphozroma rugicauda,, Leach. 



1814. Sphceroma rugicauda, Leach, Edin. Encycl., vol. vii. p. 405. 



Habitat. — In brackish pools at Aberlady ; common. 



Genus (10) Naesa, Leach, 1818. 



13. Ncesa bidentata (Adams). 



1798. Oniscus bidentatus, Adams, Trans. Linn. Soc. , vol. v. p. 8, 

 pi. ii. figs. 3 and 4. 



Habitat. — Found alive amongst barnacles and weed scraped 

 from a ship's hull at Granton Harbour in 1888 (cf. Ann. 

 Scot. Nat.. Hist. (April 1899), p. 116). 



Valvifeka. 



Family IdotheiDyE. 



Genus (11) Idothea, Fabricius, 1798. 



14. Idothea baltica (Pallas). 



1774. Oniscus balticus, Pallas, Spicil Zool., fasc. ix. p. 66, pi. iv. 



fig. 6, A-D. 

 1825. Idotea tricuspidata, Desmarest, Consid. sur Crust. , p. 289. 



Habitat. — Firth of Forth, in shallow water at various 

 places (Leslie and Herdman). Moderately common upon 

 Laminaria and other sea-weeds in shallow water on both 

 sides of the estuary. 



15. Idothea pelagica, Leach. 



1815. Idothea pelagica, Leach, Trans. Linn. Soc, vol. xi. p. 365. 

 1868. „ ,, Bate and Westw., Brit. Sessile-eyed Crust., 



vol. ii. p. 384. 



Habitat. — " Common on the Bell Bock in the Firth of 

 Forth " (Bate and "Westwood, op. cit., p. 385). " Bell Eock " 

 is doubtless, I think, a misprint for Bass Eock, for it is 

 described as being "in the Firth of Forth," whereas the Bell 

 Eock is 13 or 14 miles north by east of Fife Ness, the 

 extreme limit of the Forth estuary on the north side. 



