MARQUAND : MOLLUSCA OF SOUTH DEVON. 1 37 



within a few miles of Exeter. It is interesting to note the 

 occurrence of H. cantiana so far west as Tamerton FoUiott, 

 a village four miles beyond Plymouth, on the very borders of 

 Cornwall, in fact. 

 Sphasrium corneum L. — Exminster marshes. River Exe, 



below Exeter. 

 S. lacustre Mull. — Exminster marshes. 

 Pisidium fontinale Mull. — Exminster marshes. 

 Paludina vivipara L. — Exeter canal, abundant; much 



eroded and encrusted. 

 Bythinia tentaculata L. and var. producta Menke. — 



Exminster marshes. Ditches near the Exeter canal. St. 



Mary's Clyst. 

 Planorbis albus Mull. — St. Mary's Clyst. Exminster 



marshes. 

 P. vortex L. — St. Mary's Clyst. Exminster marshes. 

 P. complanatus L. — Exminster marshes. 

 P. contortus L. — Exminster marshes. St. iMary's Clyst. 

 Physa fontinalis L. — Not common. Exminster marshes. 



St. Mary's Clyst. 

 Limnasa peregra, and van curta. — Common. Exminster 



marshes. 

 L. peregra var. ovata Urap. — Ide. 

 L. peregra var. labiosa Jeff. — St. Mary's Clyst. 

 L. auricularia L. — Exeter canal and river Exe near Exeter. 

 L. palustris var. elongata Moq. — Rare. Exeter canal. 



Exminster marshes. 

 L. palustris var. conica Jeff. — Exeter canal. 

 L. truncatula Mull. — Ide. Exwick. Alphington stream. 

 L. truncatula var. minor. — Banks of the Exe, under 



Countess Weir Bridge. 

 L. truncatula var. (with purple bands), Shillingford ; one 



specimen. 

 Ancylus fluviatilis Mull. — Ide. 

 A. lacustris L. — St. Mary's Clyst. 



