1 78 The Irish Nahcralist. 



Genus— BYTHINIA. 



Bytliinia tentaculata, L. 

 _ II. _ _ V. VI. VII. VIII. IX. X. — XII. 



In the eastern counties this species is pretty common, but it appears 

 to be absent in the south-west of Ireland. 



Fore;ign Distribution, — Great Britain, throughout continental 

 Europe, Asia Minor, Kashmir, Algiers, Morocco, and Siberia. 



Genus— HYDROBIA. 



Hydrobia ventrosa, Mont. 

 — ~ — — V. — — — — - — XII. 



This species, like the next, is a brackish-water form occurring in 

 estuaries, such as portions of Dublin Bay and Larne Lough. 



Foreign Distribution. — Coasts of England and Wales, Sweden, 

 France, Portugal, and Algiers. 



Hydrobia ulvse, Penn. 

 — — — — V. — — — IX. — — XII. 



Miss Warren records this species from the coast of Sligo, and it is 

 common in many localities along the east coast. 



Foreign Distribution. — Coasts of Great Britain, south Scandinavia, 

 Germany, and France. 



Genus— VALV ATA. 



Valvata piscinalis, Miill. 

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



This is a common species in slowly moving or stagnant waters in most 

 parts of Ireland. 



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

 Germany, Switzerland, Transylvania, Austria, France, north Italy, Spain, 

 Portugal, Thibet, Turkestan, Kashmir, and Siberia; (a closely allied species 

 V. sificera, in North America). 



Valvata cristata, Mlill. 

 — — — — V. — VII. — IX. X. XL.? — 



This small species has not been recorded from many Irish localities, 

 and seems quite absent in the south-west. 



Foreign Distribution. — Great Britain, south Scandinavia, south 

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

 Corsica, and Sicily. 



Genus— NE KIT IN A. 



Neritina fluviatilis, L. 

 I. XL — — V. VI. VII. VIII. IX. — — — 



In the north of Ireland this species seems to be absent, and in the east 

 it is chiefly found in canals by which it may have been brought from the 

 west, where it is more common. 



Foreign Distribution. — England, Scotland, Scandinavia, Finland, 

 south Russia, central and west Germany, Galicia, north Italy, France, 

 and Spain. 



