86 THE LAND AND FRESH WATER MOLLUSKS. 



Anodonta anatina, var. ponderosa. do., rare. 

 Bythinea tentaculata. Canal — especially at Salterhebble. 



Valvata pisinalis. do. do. 



Planorbis albus. Canal at Salterhebble ; also in a pond near Stern 

 Mills. 



P. carinatus. Canal, locally distributed. 



Physa fontinalis. A single specimen was found near Brighouse, a 

 few years ago, by Mr. Ibbetson Walker. 



Limncea peregra. Everywhere, varying in size, shape, and as accord- 

 ing to locality. 



L. peregra, var. ovata. Canal. 



L. peregra, var, lahiosa. Eare. 



L. auricularia. Small specimens in a pond at WiUow Lodge. 



L, palusti'is. Occasionally in the canal. Very fine in a pond at 

 Siddal; some specimens from this locality are peculiarly distorted — 

 excoriated and decorticated, the result of chemical actions. 



L tnmcatula. Ponds, and in almost every part of the canal. It is 

 occasionally foimd at a great distance from water. 



Ancylus fiuviatilis. On stones in a ravine at Norland, but extremely 

 small. 



Arion ater. Common everywhere. 



A. Jwrtensis. Near Sowerby bridge. 



Limax marginatus. Field near Wellhead. 



L. Jlavus. Too common in most cellars, where it seems to have 

 a particular fondness for roast-beef. 



L. agrestis. Gardens and fields, everywhere. 



L. gagates. A single specimen in Shibden in 1859. 



Succinea j)utris. Canal bank, Salterhebble, rare. 



Vitrina pellucida. Maple Dean Cloiigh, not common. 



Zonites cellarius. Common. 



Z. alliarius. Do. 



Z. nitidulut. Not uncommon in many places. 



Z. purus. Locally distributed, Norland. 



Z. Excuvatus. Some years ago, this species was not uncommon in 

 Spring Wood, the locality has since been destroyed. 



Zonites crystallinus. Common. 



Z. fulvus. Near Wood Hall, rare. 



Helix nemoralis. North Dean, common. 



