The Irish Land and Freshwater Molhisca. 151 



named varieties are known to conchologists. A very remarkable variety 

 has recently been discovered by Mr. R. Patterson in Lough Salt, Co. 

 Donegal. 



Foreign Distribution.— Great Britain, Faroe Islands, Iceland, Sicily, 

 throughout continental Europe, Siberia, and North America. 



Limnaea palustris, Miiller. 

 I. II. — — V. VI. VII. VIII. IX. X. XI. XII. 



Like the last, this species probably occurs throughout Ireland, but it 

 is not by any means so common. 



Foreign Distribution.— Great Britain, and throughout continental 

 Europe, Algiers, Morocco, Siberia, and North America. 



Limnsea glabra, Miiller. 



__ — — — — — — XII. 



This is a very rare species, and has hitherto only been found near Cork 

 and Belfast. 



Foreign Distribution.— Great Britain, south Scandinavia, north 

 Germany, France and Spain. 



Liinnsea truncatula, Miiller. 

 I. II. — IV. V. VI. VII. VIII. IX. X. XL XII. 



This, the smallest species of Limncsa, is often found at very considerable 

 elevations in mountain springs, but occurs less commonly on the plain. 



Foreign Distribution. — Great Britain, Iceland, throughout contin- 

 ental Europe, Algiers, Morocco, Canaries, Madeira, Siberia, and North 

 America. 



Genus— PHYSA. 



Fhysa foutinalis, L. 



I. II. — IV. V. VI. VII. — IX. X. — — 



According to Thompson (15) this species is common, and generally dis- 

 tributed over Ireland, but I myself do not quite share his opinion, as I 

 have rarely met with it. 



Foreign Distribution. — Great Britain, south Scandinavia, Finland, 

 Russia, Germany, Transylvania, Austria, Switzerland, Italy, France, 

 Spain, Siberia, and North America. 



Genus— APLEXA. 



Aplexa hypnorum, L. 



I. II. — — V. VI. — VIII. IX. — — — 



This species has generally been united with Ph. fontinalis under the 

 genus Physa, but it differs in the mantle being devoid of the fringes, and 

 scarcely reflected over the shell. It is rather local in Ireland, but has 

 been recorded from both the west and east coast and Achill Island. 



Foreign Distribution. — Great Britain, south Scandinavia, Finland, 

 Russia, Transjdvania, Austria, Switzerland, France, Spain, Siberia, and 

 North America. 



