24 Quarterly Journal of Gonchologij. 



this source. Found also in the neighbourhood of Stochton-on-Tees, 

 in the county of Durham. Rather doubtful in a live state. 



Faludina vivipara Linne. — Though dead, specimens of these occur 

 on our coasts. There is little doubt but that they have been brought 

 in ballast from the south of England, and to that source are attributed. 



Bythinia tentaculata Linne. — In ponds and ditches ; not common 

 near Newcastle and its district, but abundant near Stockton-on-Tees 

 and that locality. 



Valvata piscinalis Muller. — Rather rare, in ponds and slow 

 streams. The Mill Race, Jesmond Dean. More plentiful in streams 

 near Stockton-on-Tees. 



Valvata cristata Muller. — Rare, in ditches near Ponteland, in 

 Northumbe rl and . 



Planorbis nitidus Muller. — Rather rare; occurs in ponds at Red- 

 heugh and Benwell, near Newcastle, also near Middleton One Row, 

 and Stockton-on-Tees, county of Durham. 



Planorbis nautileus Linne. — In ponds in the neighboiirliood of 

 Newcastle frequently, and generally in abundance where it occurs. In 

 a pond near Whitburn, in the county of Durham. 



Planorbis nautUeus var cristata Drapamaud. — Occurs with the 

 type, but only sparingly. 



Planorbis albus Muller. — Not common, but is to be met with 

 occasionally in ponds and slow streams throughout the district. 



Planorbis glaber Jeffreys. — Not common ; is found in a pond near 

 Benwell, at Ry ton Haughs, and in a pond near the sea banks, near 

 Whitburn, county of Durham, and also more plentifully, and fine 

 specimens, on the Haughs of the River Coquet, near Rothbury, 

 Northumberland. 



Planorbis spirorbis Muller. — Frequently throughout the district. 

 Occurs in a pond near Marsden, county of Durham. 



Planorbis carinatus Muller. — Rare; is found in the neighbourhood 

 of Stockton-on-Tees, county of Durham. 



Planorbis complanatus Linne. — Moderately plentiful throughout 

 the district. Occurs at Ryton Haughs and near Stockton-on-Tees, 

 county of Durham, and at Rothbury, in Northumberland. 



Planorbis corneus Linne. — Rare ; is to be met with in the vicinity 

 of Darlington. 



Planorbis contortus Linne. — Not common. Occurs at Ryton 

 Haughs, and near Stockton, county of Durham, and at Gosforth Lake, 

 Rothbury, and near Wooler, in Northumberland. 



Physa hypnorum Linne. — In ditches and ponds occasionally, but 

 like P. fontinalis, generally plentiful when it does occur. Found in 

 ponds near Kenton, Northumberland. 



Physa fontinalis Linne. — In ponds and ditches ; generally toler- 

 ably plentiful when it does occur. Is found at Ryton Haughs, Mars- 

 den, and near Stockton-on-Tees, in Durham, and at Gosforth Lake and 

 Rothbury, on the haughs of the river Coquet. 



Limnsea peregra Muller. — Common throughout the district, in 

 ponds, ditches, and slow streams. The numerous varieties of this 



