SOAVEEBT : ON AMPULLAEIfD.E. 359 



103. Ampullaria zonata (Spix). 



Test. Fluv. Brasil., p. 1, pi. i, figs. 1, 2; Philippi, Conch. Cab., p. 9, 

 pi. ii, lig. 1 ; Reeve, Conch. Icon., figs. 53, 155. 

 Hah. — Columbia, Brazil, etc. 



Var. Aechimedis, Spix. 



A. Archimedis, Spix : Philippi, Conch. Cab., p. 9, pi. xx, fig. 1. 

 A. pi/nctn, Phil. : Conch. Cab., p. 18, pi. v, fig. 2. 



Var. MAKGiNATKA, Jonas. 



A. marginatra, Jonas: Zeitschr. f. Malak., 1845, p. 69; Philippi, 

 Conch. Cab., p. 63. 



Sub-genus CERATODES, Guikling. 



Ceratodes, Guikling: Zool. Journ., 1828, vol. iii, p. 540. 

 Marisa, H. & A. Adams {7ion Gray). 



104. AmPULLAUIA COKNTTAllIETIS (Linn.). 



Helix cormiarietis, Linn. : Syst. Nat., 1758, lOtli ed. 

 Planorhis cornuarietis, Lamk. : Systeme, p. 93, 

 A. Knorri, Philippi: Conch. Cab., p. 37, pi. xviii, fig. 3. 

 A. rotula, Mousson. 



A. Chiquitensis, D'Orb. : Voy. Amer. Merid., p. 367, pi. xlviii, fig. 10. 

 Hah. — Parana, Trinidad, Venezuela, New Granada, etc. 



105. Ampullaria planorbola, Philippi. 

 Conch. Cab., p. 26, pi. vii, fig. 3. 



Hah. — Para. 



Sub-genus POMELLA, Gray. 

 Pomella, Gray: Proc. Zool. Soc.', 1847, p. 148. 



106. Ampullaria megastoma, Sowerby. 



Tank. Cat. App., 1825, p. 10. 



A. neritoides, D'Orb. : Voy. Amer. Merid., p. 368, pi. xlix, figs. 1, 2. 



Hah. — ITruguay. 



This fine species stands quite alone, distinguished principally by the 

 great size of its aperture. 



DESCRIPTION" OF THE NEW SPECIES.^ 



Ampullaria Da CosTin, n.sp. 



Testa mediocriter umbilicata, ovato-turbinata, tenuis, nitens, 



fuscfscens, fusco fasciata, postice purpureo tincta ; spira convexe 



turbinata ; anfractus 5, rotunde convexi, obscure suboblique plicato- 



striati, sutura angustissiraa sejuncti; anfractus ultimus 4- longitudinis 



1 The types of these species are now iu tlie British Museum. 



