124 



I have taken specimens from a ditch at Blackpool 

 five-eighths of an inch long by three lines broad, and 

 Montagu remarks that he found some three-quarters of 

 an inch long. 



The colour of the animal is nearly black. 



M.fBouchard Chautereaux says it lays from three to 

 twelve eggs, which hatch in 16 days. 



A widely diffused but exceedingly local shell, inhabit- 

 ing slow streams and plashes of water, especially the 

 latter. 



The places where it is obtained in this neighbour- 

 hood are — ditches of clear water in the gardens close to 

 the river Leen in the- Nottingham Park, another in a 

 field at Beeston, and a third below the Railway Station 

 at Beeston. 



More distant ones are — Fremington House, Devon" 

 shire, where it grows to a large size (Jeffreys), Bristol 

 (Miller), Wiltshire (Montagu), Essex (Sheppard), 

 Mitcham, Surrey (Peti?er), London (Grey), Ross, Here- 

 fordshire, Ormskirk, and Chaigeley Manor, Lancashire 

 (Winstanley), Blackpool (The Author), Newcastle 

 (Alder), &c. In the south and midland counties of 

 Scotland (Forbes). Ireland (Brown). 



In France (Draparnaud), in Sweden (NilsonJ, in 

 Germany (Pfeiffer), and if the Physa elongata of Say 

 proves to be a variety of this species, it will be in 

 America (Say). 



I am not aware that it has ever been found tossil. 



Planorbis. 



The members of this somewhat numerous family of 

 discoidal shells bear a striking resemblance in general 

 form to the Ammonites of the ancient world, they are 



