126 THE LAND AND FRESHWATER MOLLUSCA OF DORSETSHIRE. 



eighths of the shell; suture shallow, nearly horizontal; mouth 

 narrowed above, enlarged below, exceeding the rest ot the shell in 

 length ; outer lip thin, reflected outwards, strengthened internally 

 near the edge by a callosity, which is often furnished with a tubercle 

 near the middle ; inner lip, with two strong folds, and often a small 

 tubercle above them. L.0.325. B.0.15. 



Hab. On mud flats and estuarine salt marshes, under stones 

 on the cliffs of the sea-coast, at various heights, far above high 

 water-mark. Weymouth, in ditches and marshes overflowed by 

 the salt water-, Bryer (Pulteney). On the summit of the cliff, 

 between Tilly Whim and Dancing Ledge, Langton Matravers 

 (J.C.M.P.). River Frome, below Wareham. Purbeck paper. 



I include this species in our list, as one of its Purbeck 

 habitats is subaerial and never reached by the sea-wave, even, 

 at the highest spring tide. Mr. Gwyn Jeffreys rightly 

 places it in the marine section of British Conchology, as do 

 Montagu and Ferussac. It is included among the land shells 

 by Draparnaud and Lamarck, under the generic name of 

 Auricula ; the whole of this family with few exceptions 

 (Carychium, Scarabus), frequent salt-marshes and the vicinity 

 of the sea. 



FAMILY V. CYCLOSTOMATID.E. 



Shell spiral, rarely much elongated, transversely striated; mouth 

 nearlv circular ; peristome uninterrupted; operculum distinctly spiral; 

 umbilicus oblique and small. 



