362 JOURNAL OF CONCHOLOGY, VOL. 9, NO. 12, OCTOBER, I90O. 



variability in shape, colour, and texture, so much so, that I think it 

 may be said that many of the larger varieties are reproduced in a 

 dwarf form in this district. 



Var. lacustris. — The Ritec stream, Tenby, and a stream at 

 Manorbier. 



Var. lutea. — Ditches on Penally Marsh. 



Var. acuminata. — Ditch by the Black Rock. 



Var. vulgaris. — Various ponds and ditches. 



Var. oblonga. — Stream near Old Waterworks, Tenby, and 

 stream near Manorbier Station. 



Var. labiosa. — Ditch by roadside, Laugharne (Chas. Jefferys). 



Var. picta. — Stream and pond near the schools at Pendine ; 

 these are beautifully banded. 



Var. maritima. — Ponds and ditches ; very common. 



Var. pulchella. — Ditch on Gumfreston Marsh, and a small basin 

 in the Old Waterworks, Tenby. 



Monstrosity. — See above, page 108. 

 L. palustris.- — Abundant in the marshes. There is considerable 

 variation in this species also, especially in colouring. The finest 

 shells come from the Black Rock ditch, where it is very plentiful. 



Var. elongata. — Ditch by the Black Rock. 



Var. tincta. — Scarce ; a few specimens from a ditch near Hollo- 

 way Quarry. 



Var. albida. — Five specimens of this very rare variety have been 

 taken from the Black Rock ditch. 



Monst. decollatum. — Not uncommon in Penally Marsh. See 

 also page 107 above. 



L. truncatula. — Very common and widely diffused ; April and 

 May are the best months to look for them. The largest measure 13 

 mm., and come from a roadside stream near Manorbier Station ; the 

 smallest adults measure 5 mm., and come from Gumfreston. The 

 colour varies exceedingly: ash-coloured, yellowish-brown, pale-brown, 

 to a deep magenta, while some are tinged with lilac. 



Var. elegans. — Very fine in a ditch on Tenby Marsh, and at 

 Manorbier. 



Var. microstoma. — Marsh Road near Holloway Quarry. 



Var. major. — Stream at Manorbier, length 13 mm. 



Var. minor. — Ditch near Gumfreston, length 5 mm. 



Monstrosities. — Two turreted specimens have been taken. 

 Ancylus fluviatilis. — On account of the scarcity of fast-running 

 streams, this species is not common. It is found in fair numbers 



