of British Mollusca. 341 



274. Planorhis umhtlicatus, Mull., = P. complanatus, Jeffr. 

 (non Linn.). 



P. complanatus , L., is generally now regarded as P. nitidas, 

 and not the present species, which, however, has been called 

 complanata by Stein, Dupuy, Moquin-Tandon, Locard, 

 Bourguignat, &c. 



275. Planorhis vortex (Linn.). 



276. Planorhis spirorhis (Linn.). 



[Planorhis dilatatus, Gould. 



Planorhis dilatatus, Gould, Invert. Mass. (1841), p. 210, fig. 140; ibid, 

 edit. Biniiey (1870), p. 493, fig. 748 ; Rogers, Jouru. Conch, vol. i. 

 (1874), p. 81. 



An accidentally introduced species, which appears to have 

 established itself in the neighbourhood of Manchester in the 

 Bolton Canal at Pendleton and Galton {Thos. Rogers).'] 



211. Planorhis glaher^ Jeffreys. 



278. Planorhis alhus, Miiller. 



279. Planorhis nautileus (Linn.). 



280. Planorhis complanatus (Linn.) = P. nitidus, Grc\.y = II. 

 fontanus, Lightfoot. 



Genus 5. Segmentina, Fleming. 



28L Segmentina nitida (Miill.) = Planorhis lineatus (Walker), 

 Jeffr. 



Judged out of his own work, by comparing what is said of 

 Miiller's Planorhis nitidus in vol. i. p. 80, and vol. v. p. 172, 

 Jeffreys shows that that species is the present and not the last 

 to which he referred it. 



Fam. 11. Physidae. 

 Genus 1. Physa, Lamarck. 



282. Physa fontinalis (Linn.). 



Subgenus Aplexa, Fleming. 



283. Physa hypnorum (Linn.). 



[To be continued.] 

 Ann. & Mag. N. Hist. Ser. 6. Vol. vi. 24 



