176 Proceedings of the Roi/al Irish Academji. 



B. Apex of telson rounded. 



(a). Outer ramus of uropods more than double the 

 length of the inner ramus, . 



{I). Outer ramus of uropods less than double the 

 length of the inner ramus, . 



PUloscia patimcei has not yet lieeu taken in Ireland. 



couchii 



patiencei 



PMloseia muscorum (Scopoli). 



35 35 40 39 





33 36 37 



38 



27 28 29 32 





26 25 30 31 





16 17 2i 23 22 





15 18 19 21 





9 10 ii 13 20 





2 8 7 11 12 





14 5 6 





3 





described by Mm in 1858. In Ireland 

 it has been found only ou the southern 



This species is one of the commonest 

 vre have in damp places, and is easily 

 recognized, though it is subject to great 

 variation in colour. In many places 

 bright red and yellow specimens occur. 



"We have received it from numerous 

 localities in all of the 40 eoiuity 

 divisions. It is equally common in 

 Great Britain, and all over the Con- 

 tinent of Europe, and is also found in 

 Noithern Africa. 



Philoscia couchii Kiualian. 



This rare species was found originally 

 at Talland Cove near Polperro in Corn- 

 wall, by Prof. Kinahan, and was 





35 



34 



40 



39 









33 



36 



37 



38 



27 



28 



29 



32 









26 



25 



30 



31 





16 



17 



24 



23 



22 







15 



18 



19 



21 





9 



10 



14 



13 



20 





2 8 



7 



11 



12 







1 4 



5 



6 









3 













shore of the Hill of Howth, wliere it 

 was taken in some numbers by one of 

 us (D. E. P. B.) in Sept., 1908. Its 

 habitat here, as in Cornwall where it 

 was discovered, is amongst the shingle, 

 just above high- water mark. Since 

 Professor Kinahan's discovery it has 

 only been taken in two other localities 

 in England, both being in Devonshire. 



M. A. Dollfus records it from France, 

 Spain, and Sicily, and Canon A. M. 

 Norman from Sebastopol, Crimea. 



It has also been taken in the Azores, 

 Canaries, and along the Mediterranean 

 coast of Africa, and at Syracuse 'in Asia 

 (Dollfus). 



PLATYARTHETJS. 



The genus Platyarthrus, of wliich there are two known species, is repre- 



