INLAND MOLLUSCA OF SOMERSET. 149 



rhines of Kenn Moor, and in a pond near Wells, also at 

 Weston-super-Mare. 



P. glaber, Jeffreys. " My Planorbis glaber (P. laivis of 

 Alder) was first found at Bristol. It is the Planorbis 

 Eossmassleri of Continental Avriters." — Mr. Jeffreys in litt. 

 We have taken it fine and in great abundance in a large 

 pond by the railway side, at the third (?) bridge from 

 Clevedon. 



P. nautüeus, Linna;us. Turbo nautileus, Mat. and Pack., 

 Trans. Linn. Soc, vol. vili., p. 169. Planorbis imbricatus, 

 Drap., Müll. Fer. et FIuv. France, p. 44. Common in 

 small ponds, especially during the spring months. Occa- 

 sionally met vvith in the moor ditches. 



P. carinatus, Müller. Much less common than the 

 succeeding species, in Company with -which it is found. 



P. marginatus, Helix planorbis, Mat. and Pack., Trans. 

 Linn. Soc, vol. vüi., p. 189. Abundant in the rhines of 

 all the moors, and common in ponds and ditches. 



P. vortex, Linnteus. Helix vortex, Mat. and Kack., 

 Trans. Linn. Soc, vol. vüi., p. 189. Very common on the 

 whole of the western side of the county in rhines and ponds. 



P. spirorhis, Linnasus. Helix spirorbis, Mat. and Pack., 

 Trans. Linn. Soc, vol. vüi., p. 191. Much less common 

 than the last, and morc local in its distribution. Extremely 

 abundant in ditches near the mouth of the river at AVick. 



P. contortus, Linn^eus. Helix contortus, Mat. and Pack., 

 Trans. Linn. Soc, vok vüi., p. 191. Very abundant in 

 rhines, ponds, and small ditches. A large proportion of 

 the specimens from a small pond near Walton old Church 

 are distorted, having the whorls irregularly coüed, and 

 often fülded ovcr each other. 



P. nitidus, Müller. PIclix fontana, Alat. and Pack., 

 Trans. Linn. Soc, vol. vüi., p. 193. In clear ponds among 



