242 Mr. W. Thompson's Additions to the Fauna of Ireland. 



ticular examination of the colours at home, they were placed in a 

 phial of sea- water, but were all dead on my arrival there a few hours 

 afterwards. Of the many species of the more minute forms of Crus- 

 tacea which I have preserved in spirits, the Mysidm were always 

 among the first to become soft and to decay. The specimens under 

 consideration, when examined in spirits, exhibited on each segment 

 of the body a black spot, whence more or less of an arborescent 

 appearance was manifest. 



M. chamceleon has occurred to me much more frequently as well 

 as in greater numbers on the Irish coast than M. vulgaris. In very 

 shallow pools between tide-marks at Lahinch (co. Clare) the latter 

 was procured by Professor E. Forbes and myself. It frequents the 

 tidal river Lagan at Belfast. 



Order Amphipoda. 

 6. Orchestia, sp. 

 Bangor, co. Down, 1835, W. T. ; distinct from 0. littorea. 



7. Amphithoe fucicola, Leach (sp.) ; Edw. vol. iii. p. 32. Phe- 

 rusa fucicola, Leach, Linn. Trans, xi. p. 360. 



Obtained many years ago at Youghal by Mr. R. Ball. Leach only 

 appears to have noticed this species: he remarks, "Habitat inter fucos 

 in Damnonise australis mari rarius." 



8. Amphithoe rubricata, Mont, (sp.) ; Edw. vol. iii. p. 33. 

 Procured in Strangford lough in Oct. 1839 by Mr. Hyndman and 

 myself. In shallow rock-pools between tide-marks on the open coast 

 at Springvale, co. Down, I obtained several specimens in July 1846. 

 Previously noticed only as found on the south coast of Devon by 

 Montagu. 



9. Amphithoe, sp. 



Bangor, co. Down, 1835, W. T. ; distinct from the preceding and 

 A. obtusata, on comparison with the specimens in the British Mu- 

 seum. 



10. Gammarus marinus, Leach ; Edw. vol. iii. p. 46. 



Strangford lough, 1837, Mr. Hyndman and W. T; Ballysodare, 

 co. Sligo, Mrs. Hancock. 



Noticed by Leach as found on the south coast of Devonshire and 

 by M. Edwards on the coast of France. 



11. Gammarus campylops, Leach; Edw. vol. iii. p. 48. 



Taken at high water in the tidal river Lagan, above the bridge at 

 Belfast, May 1836, Mr. Hyndman and W.T. 



Shore of Loch-Ranza, Isle of Arran, where the species was dis- 

 covered by Leach, the only locality hitherto noticed. 



12. Gammarus longimanus, Leach (sp.). Mara longimana, Leach 

 MSS. 

 A single one taken with last : — same as Leach's unique specimen 

 in the British Museum. 



