isoroDA. 401 



Arcturus longicornis. West. 

 Leachia — Sower, (sp.). 



On examination of a sijecimen dredged by Mr. Hyndmanin July, 1851, 

 off the Copeland Islands, in from 30 to 50 fathoms, I find it to be this 

 species as distinguished from Leachia intermedia, and L. gracilis, Goodsir. 

 Body of the specimen 1 1 lines in length. Antenna (inferior), if perfect, 

 would be of equal length ; wanting the last segment, they are lOi lines. 



Genus Idotea. 

 I. pelagica, Leach. 



Dredged off Ballyhome Bay. Strangford Lough ; Dundrum : Bally- 

 walter, W. T. 



Found among Derry oysters, W. T. 



I. tricuspidata, Edw. 



Down and Antrim, coasts and bays. 



Donaghadee, 8—10 fathoms. Dr. Drummond. 



Dublin Bay, Professor Allman. 



Connaught ; Lahinch, Co. Clare, W. T. — both littoral and dredged. 



I have found it in the stomach of gulls. 



I. emarginata, Edw. 



Templeton's notes, " on rocks." 



Dundrum, 1836, W. T. 



August 2Gth, 1836. I should suppose that plants are as food especial fa- 

 vourites with this Idotea, as when looking over heaps of sea-weed, contain- 

 ing many different species, thrown among the rocks at Newcastle (in the 

 Co. of Down), I found the 3Iesogloia rermicularis variously attacked by 

 numbers of them, and every piece of it I saw had been more or less con- 

 sumed by them. The other jilants had not been touched, nor were any 

 Idotea upon them. It should be stated that the Mesoghia did not consti- 

 tute more than perhaps a 28th part of the mass of sea-weeds. 



J. linearis, Edw. 



Newcastle and Dundrum, W. T. 



South of Ireland, J. V. Thompson. 



Youghal, Dr. Ball. A specimen thence 2^ in. long, including antennae. 



/. acuminata, Leach. 



Among Crustacea kindly sent from Dublin for my inspection by Dr. 

 Ball, were two individuals of an Idotea 10 lines in length, very dis- 

 tinct in form from our three common species, the /. pelagica, I. entomon, 

 and /. cestrum of Leach. They were purchased of Mr. M'Calla, but on 

 what pai't of the coast taken was not stated. I mark the species -with 

 doubt on account of Leach's only specimen in the British Museum, with 

 which they were compared, being in a bad state of preservation. The I. 

 acnmindta was first noticed in the British Museum Catalogue of Crus- 

 tacea, p. Oo (published in 1847), as among Dr. Leach's inedited species. 

 He obtained it on the coast of Devon,' and called it in his MS., Leptosotna 

 lancifer. 



2 D 



