100 PHYSID.E 



1843. Physa plicala : DeKay, Nat. Hist. New York, Zool. 



V, Moll., p. 78, pi. V, f. 85. 



1844. Physa Philippii, Kiister : Kuster, in Martini & Chem- 



nitz, Conch.-Cab., Physa, p. 19, pi. iii, f. 3-6. 

 1850. Physa Charpentieri, Kuster : Kuster, in Martini & 



Chemnitz, Conch.-Cab., Physa, p. 23, pi. iv, 



f. 4-6. 

 1852. Physa rivalis, Maton & Rackett : Forbes & Hanley, 



Brit. Moll, iv, p. 145. 

 1857. Aplexus rivalis : Gray, in Turton's Manual, new ed., 



p. 227, pi. ix, f. 112. 

 1862. Bulla rivalis, Maton & Rackett : Jeffreys, Brit. Conch., 



i, p. 100. 

 1865. Physa Primeana, Tryon : Tryon, Amer. Journ. Conch., 



i, p. 227, pi. xxiii, f. 12. 

 1865. Physa lata, Tryon : Tryox, t. c, p. 227, pi. xxiii, f. 7. 



First recorded as British in 1807, by W. Turton. {See 



ref. above.) 

 British Distribution in Time : Piecent. 



Genus : 2. APLEXA, Fleming. 



Etym. : — Gr. (ox auct.) " a + ^rAe'^ts, Laciua," without a plait. 

 Type : — Bulla hypnorum, Linnseus. 



(Bulla, Planorbis, Bulinus, Bullinus, Bulimus, Helix, Physa, 

 vett. auctt.) 



1819. Nauta : Leach, Moll. Brit. Synop. (proofs), p. 152. 



1820. Aplexa : Fleming, Brewster's Edinb. Ency., xiv, p. 617. 

 1831. Nauta: Leach, in Turton's Manual, p. 128, in synon. 



of Physa. 

 1840, 1 Aplexus, Fleming : Gray, in Turton's Manual, new ed., 

 Apr. J p. 255. 



Post \ Amplexa : Brown, Illust. Conch. Brit., ed. 2, p. 31, in 

 Sept. - synon. [Non Amplexus, Brown, op. cit., 



1840. J p. 45.] 



1846. Aplecia : Herrmannsen, Ind. Gen. Malac, Prod., i, 



p. 64. [Non Guenee, 1838 (Lepid.).] 



1847. " Myxas, ' Leach,' Guild." : Gray, Proc. Zool. Soc, xv, 



p. 180, no. 507. 



1. Aplexa hypnorum (Linnaeus). 



Etym. :— Lat. gen. pi. of Hypnum, a genus of Mosses. 



1758. Bulla hypnorum : Linn^us, Syst. Nat., ed. 10, p. 727, 



no. 341. 

 1767. Bulla hypnorum : Linn^us, o. c, ed. 12, p. 1185, no. 387. 

 1774. Planorbis turritus : Muller, Verm. Hist., ii, p. 169. 

 1774. Planorbis gelatinus : Muller, t. c., p. 170. 

 1781. Bulinus turritus : Muller, Naturforscher, xv, p. 6. 



