40 THE FAUNA OF CLYDESDALE. 



MOLLUSCA LAND AND EKESH WATER 



The arrangement and nomenclature of Jeffrey's British Conchology are 

 followed. The area included is Lower Clydesdale. The following published 

 district lists have been consulted: A list of land and fresh water Mollusca 

 in Landsborough's Natural History of Arran, Ailsa Craig, and Cumbraes, 

 1852; "On the Land and Fresh Water Mollusca found within Ten Miles 

 round Glasgow," by John Dougall in Proc. Nat. Hist. Soc. Glasgow, voL i.; 

 " On the Distribution of the Helicidse in Bute and in the Vicinity of Largs," 

 by William Haddin in Proc. Nat. Hist. Soc. Glasgow, vol. i. 



Order Lamellibranchiata. 



Sphserium corneum, L. Common. 



lacustre, Mull. Fossil Marsh and the Forth and Clyde 



Canal at Firhill. Possibly introduced. 

 Pisidium amnicum, Mull. River Clyde above Rutherglen Bridge. 



fontinale, Drap. Possil Marsh and a ditch between Frank- 



field and Hogganfield. 



var. cinerea, Alder. Possil Marsh, Pond near Bishopbriggs. 



pusillum, Gmelin. Possil Marsh, pool in the vicinity of the 



Cloch, and ditch near Mugdock Castle. 

 var. obtusalis, Pfeiff. Arran. 



nitidum, Jenyns. Frankfield Loch. 



Unio margaritifer, L. Eiver Clyde at Cambuslang. 



Anodonta cygnea, L. Paisley Canal; empty shells in Bardowie 



Loch, Eiver Cart at Cardonald Mills, 

 and River Clyde above Cambuslang. 



Dreissena polymorpha, Pallas. Forth and Clyde Canal, common; not 



native. 



Order Pectinibranchiata. 



Bythinia tentaculata, L. F. Possil Marsh, St. Germains' Loch, Forth 



and Clyde Canal, Paisley Canal. 



Valvata piscinalis, MulL F. Paisley Canal, Forth and Clyde Canal 



at Dalmuir, and Possil Marsh, 

 cristata, MiilL Possil Marsh and Forth and Clyde Canal 



at Firhill. 



c 



Order Pulmonobranchiata. 



Planorbis nitidus, Mull. Forth and Clyde Canal at Firhill. 



nautileus, L. Arran. 



albus, Miill. Common, 



spirorbis, Miill. Small Marsh on Rutherglen Road, Bishop 



Loch, pool near Inverkip. Arran. 

 contortus, L. Pond near Robroyston and Frankfield 



Loch. Arran. 



