The characters, therefore, given to the genus _Ampullaria_ by Mr. G. Sowerby, will be found incorrect. There was no necessity for explaining, much less for altering, (in this instance,) the masterly definitions of Cuvier and Lamarck. With regard to the second species given by Mr. Sowerby to illustrate this genus, he is no less in error; for the real _A. rugosa_, of all authors, is a strikingly distinct shell from that which he has figured under this name. This will be sufficiently obvious by referring to the figures either of Lister, Chemnitz, or Lamarck. Having offered these remarks on a subject to which I have paid some attention, I wish to refrain from pointedly noticing other errors and misconceptions into which Mr. G. Sowerby has fallen; rather wishing that greater experience, and more matured judgment, may lead him to do this himself, prior to the publication of the system of Conchology which he has announced. * * * * * GENERAL ALPHABETIC INDEX OF LATIN AND ENGLISH NAMES TO VOLUME II. Pl. Achatina emarginata 84 fasciata 74 vittata 84 _Chesnut-banded_ 74 _notched_ 84 _Ribbon_ ib. Ampullaria, Gen. Char. 103 fasciata ib. globosa 119 Anodon, Gen. Char. 96 rugosus ib. _Apple-snail, banded_ 112 _globular_ 119 _Aracari, lettered_ 90 _Bee-eater, black-capped_ 76 Botis, Gen. Char. 77 bicolor ib. marginata 77 Cinnyris, Gen. Char. 95 chalybeia 95 Conus carinatus 112 cinctus 110 generalis 118 Princeps 86 pulchellus 114 terebra 70 _Cone, carinated_ 112 _Flambeaux_ 118 _Orange Admiral_ 114 _Prince_ 86 _Screw_ 70 _Cowry, Mosaic_ 111 _Courier, black-bellied_ 106 _Crab-eater, Cinnamon_ 67 _Creeper, lesser-collared_ 95 Cursorius, Gen. Char. 106 Temminckii ib. Cypraea, Gen. Char. 111 tessellata ib.