3880 Mollusks. 



Succinea putris. Abundant among the herbage on the sides of 

 marshy places, ditches, &c. 



„ Pfeifferi. Rare, in ditches. 



Bulimus lubricus. Common. 



„ obscurus. Rare, among the ruins of Dunottar Castle. 

 Pupa umbilicata. Common. 



„ marginata. Not common. Found on the sand-hills in the 

 link between the Dee and Don. More plentiful in some seasons than 

 in others. 



Vertigo edentula. Rare. Found at the roots of ferns, sometimes 

 on the fronds. 



Clausilia nigricans. Common, but rather local ; at the foot of 

 rocks some distance South of the Bay of Nigg. 



Balea perversa. Rare. Among the ruins of Dunottar Castle, and 

 at the foot of a wall behind Old Macher cathedral ; Old Aberdeen. 

 Charychium minimum. Rare. Rubislaw Den. 

 Limnseus pereger. Common. 



„ „ var. ovatus. Abundant in Loch Skene ; pools 



on the banks of Dee. 



„ „ var. limosus. Common in marshy places, at 



Old Aberdeen and Bay of Nigg. 



„ palustris. Not common. In pools and streams, near the 

 sea, and in the low districts. 



„ truncatulus. Rare. Found in the pool in Belhelvie 

 Links, by my friend Mr. Wilson ; Hilton quarries. Of this shell there 

 many varieties, depending much on the situation. 



Physa fontinalis. Common : in ditches at Nether Banchory ; on 

 Lemna minor and Potamogetons in the ditches or streams that run 

 into the Dee and Don. 



Planorbis vortex. Common ; on aquatic plants, as Potamogetons. 

 „ spirorbis. Abundant in a ditch at Banner-mill, and in 

 the links, where it is found on Poa fluitans, Ranunculus aquatilis, &c. 

 „ contortus. Not common. In ditches and pools, upon 

 grass and decayed leaves, in the Old-town links and at Nether Ban- 

 chory. 



„ albus, Flem. Rare. On the leaves of Potamogetons in 

 the canal near Aberdeen. 



Ancylus fluviatilis. Common on stones in streams, and the rivers 

 Dee and Don. 



Cyclas cornea. Rare. A beautiful specimen has been found by 

 Mr. Ewan, in a pool at Morrison bridge. 



