402 CRUSTACEA. 



Genus Tanais. 

 T. Dulonr/ii, Audouin (sp.). 

 Two Crustaceans which I found on Alaria esculenta washed ashore at 

 the Giant's Causeway in July, 1839, seem so like this species as figured in 

 the great French Avork on Egypt, that I am disposed (in which Mr. Adam 

 AVhite agrees with me) to consider them the same. They do not exhibit 

 any point of difference, but are not quite perfect. The second species of 

 iVniais described by M. Edwards is from Naples. M. Kroyer has de- 

 scribed three species in the Isis, one of which is from Bahia, and the 

 other two from Madeira. 



Genus LiMNORlA. 

 L. terebrans, Leach. 



Of general occurrence. 



Oet., 184G. Mr. Getty and Mr. Hjiidman found one of the beacons 

 lately put down at Garmoyle eaten by the Limnoria, and brought me a 

 portion of the wood with its borers. 



May 1st, 1848. Having heard that one of the perches or beacons in 

 Belfast Bay (that longest down) was carried away by being struck by a 

 vessel near Garmoyle, I examined it on being brought to the dock, and 

 found that only about ^ of the wood remained, where the perch had been 

 covered by the sea at low water. The Limnoria alone had consumed 

 I of the wood, and many of these creatures were living in the wood when 

 I examined it. The perch was within a month of being six years down. 

 The wood, where eaten away, had been about 12 inches in diameter. 

 The portion above low water-mark had not been touched. This as well 

 as the part attacked had been smeared with tar. 



Genus AsELLUS. 

 A. aqiiatictis, Oliv. 

 " Common in rivulets and ditches." Templeton MSS. 



Genus Jaera. 

 /. albifrons, Mont. (sp.). 

 Common under stones in shallow rock-pools between tide-marks at 

 Bangor, Belfast Bay (1834, W. T.), and in Strangford Lough, both strict- 

 ly marine localities ; also obtained in the tidal river Lagan, at Belfast. 

 Known only hitherto as found on the coast of Great Britain. 



Genus Oniscus. 

 O. asellus, Linn. 

 " Common among rotting timber." Templeton MSS. 

 South of Ireland, J. V. Thompson. 



Genus Lygia. 

 L. oceanic a, Fabr. 

 Of general occurrence. 



Nov., 1847. Mr. Darragh tells me is very common on the beach at 

 Ballymacarrett (Belfast), and very often entered and ran about the floor 

 of his house, the back of which rises direct from the beach. 



Genus Philoscia. 

 P. muscorum, Latr. 

 South of Ireland, J. V.' Thompson. 



