182 



Proceedings of the Royal Irish Academj/. 

 CYLISTICTJS. 



"With the genus Cylisticus we come to the first of that class of Woodlouse 

 which is capable of rolling itself into a ball, though in this genus the power 

 is not so complete as in those which follow. This is owing to the fact that 

 the tail-appendages (uropods) are long and styliform, and project beyond the 

 end of the telson, whereas they are always very short and broad in the 

 genera Armadillidium and Eluma. 



There are seven known species of this genus, but only one is found in this 

 country. 



Cylisticus convexus (De Geer). 



35 



3^ 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 







This species, thougli recorded from 

 eleven counties, is nowhere abundant in 

 Ireland. It has been taken at Killaloe, 

 N. Tippeiary (R. A. P.) ; Goresbridge, 

 Co. Kilkenny (R. F. S.) ; Borris, Co. 

 Carlow (R. F. S.) ; Leixlip, Co. Kildare 

 (R. F. S.) ; Howth, Co. DubHn 



(D. R. P. B.) ; Clare Island, W. Mayo 

 (R. LI. P. and D. R. P. B.) ; Tempo, Co. 

 Fermanagh (R. F. S.) ; Ballyshannon, 

 E. Donegal (A. W. S.); Ballyholme 

 (D. R.P. B.), Groomsport (W. H".P.), 

 Hillsborough (N. H.F.), Ballynafeigh 

 (J. N.M.), and Magheralin (A.W. S.), 

 Co. Down; Belfast, Co. Antrim (A. "W". S. 

 and R. "W.) ; and Londonderiy City 

 (D. C. C). From this list it can be seen 

 that it is more plentiful in the neigli- 

 bourhood of Belfast than in any other 

 part of the country. It occurs in 

 scattered localities over the greater part 

 of northern Europe and also in North 

 America (Budde-Limd). In England it 

 has been found only in the south, but it 

 has also been taken in several parts of 

 Scotland. 



AEMADILLIDITJM. 



There are, according to M. Budde-Limd, forty-five species of the genus 

 ArmadiLhdium, the great majority of them being inhabitants of Europe and 

 nortbem Africa. Only three of these species have as yet been taken in 

 Ireland ; but we give also the characteristics by wliich A. depressum Brandt; 

 foxmd in the neighbourhood of Bristol, and A. album Dollfus, recorded from 

 the estuary of the Taw and Torridge. Devonshire, in England, may be distin- 

 guished, as it is possible that tliese species may eventually be found in this 

 coimtry. 



