Testaceous Pneumonobranchous Mollusca of Great Britain." 521 



Physa. 

 1 bis. P. alba. 



Phyza. Risso. 



Animal 



Testa sphaerico-ovata, ventricosa, fragilis, diaphana, stri- 

 atula, alba. Anfr actus 3 — 4, globosi; sutur^ exca- 

 vata ] spird brevissima, acutiore. Apertura larga, 

 ovata. 



Long. 0.275.— Diam. 0.175. 



Physa alba. Turton in Zool. Journ. No. vii. p. 363. t. xiii. 

 /.3. 

 Dr. Turton says, this rare and eminently beautiful species Avas 

 sent him by Mr. Blomer as from the river Towin, North Wales. 

 Lady Elizabeth Finch did me the honour of presenting me with 

 a specimen, which I believe was procured through the same 

 channel. Mr. Sowerby has this species from Sicily ; and I 

 fear Dr. Turton has been deceived or mistaken in its British 

 locality. 



P. hypnorum, p. 382. 



Var. a. minor, magis oblonga. 

 In pools on Crymlyn Burrows near Swansea, rare. Colour 

 a deep and bright bronze. 



Planorbis. 

 P. Vortex, p. 382. 



The variety a of my Synopsis is abundant at Battersea ; and 

 the other below the Thames about Woolwich. 



P. corneus, p. 383. 



Neighbourhood of Dublin: App. to Welsh ^ Whitelaw's Hist, 

 of Dublin. 



P. lutescens, p. 385, lege disciformis. 

 1 ^ 3x2 Not 



