TAEEK AX ALNJMOUTH, NOETHTJMBEEIAND. 431 



sections (in the British Museum) have now, as I. am informed 

 by Professor T. Jeffrey Bell, deteriorated so as to be useless. 

 For a revision, therefore, of my original description I have had 

 to depend entirely on the new material obtained at Alnmouth. 

 My chief difficulty has been with the mouth-organs, in the exam- 

 ination of which I have sacrificed all my specimens. The result, 

 though not entirely satisfactory, is such as to render a new de- 

 scription of the animal desirable. This will be found on a suc- 

 ceeding page. 



The following list comprises all the Crustacea noticed by me 

 during my visit to Alnmouth — 29th August to 12th September. 

 My collecting was confined to the littoral zone: I did neither 

 dredging nor tow-netting. The greater part were obtained in 

 weedy pools among the rocks near low- water mark, others on the 

 muddy river bank or in brackish pools subject to tidal overflow: 

 the estuarine forms are marked in the list with an asterisk. 

 Some of the species are new to our district; a few are apparently 

 new to science : of these I give here brief descriptions. For the 

 detei'mination of the Amphipoda and Isopoda I am indebted to 

 the Rev. Canon Norman who kindly examined my specimens. 

 Amongst this group Dr. Norman considers the following as ad- 

 ditions to our local fauna ; Paratylus uncinatus (G. 0. Sars), 

 Apherusa horealis (G. 0. Sars). Amongst the Schizopoda, 

 Siriella norvegica and >.S'. armata are hitherto unrecorded. The 

 more interesting species of Entomostracaare considered in detail 

 further on. 



Schizopoda. Macromysis flexuosus. (Miiller). (Very abun- 

 dant in the river and in tide-pools). 



Siriella armata, G. 0. Sars. 

 ,, norvegica, G. 0. Sars. 

 Amphipoda. Apherusa bispinosa, Sp. Bate. 

 ,, jurinei, M. Edwards. 

 ,, borealis. G. 0. Sars. 



Calliopius Eathkei, Zaddach. 



Paratylus uncinatus, G. 0. Sars. 



Gammarus locusta, Linn. 



Amphithoe rubricata, Mont. 



