This (a common shell) can be no other than the _M. ferruginea_ of Lamarck, though neither that author nor any other has noticed its primary distinguishing character, that of the uncommon thickness of the outer lip at the margin, which is also divided into convex obtuse crenations; in young shells this is not apparent; such is Martini's figure. Mr. Dillwyn has changed Lamarck's name to _Vitulina_ for this, and given the name of _Abbatis_ to the variety more lengthened, figured by Chemnitz; but which, from specimens now before us, we consider with Lamarck only as a variety, possessing all the essential characters here given to both. * * * * * GENERAL INDEX TO VOL. I. IN THE ORDER OF PUBLICATION. Pl. || Pl. Psittacus Cayennensis 1 || Parakeet, Cayenne gold-winged 1 || Sitta frontalis 2 || Blue Nuthatch 2 || Mitra zonata 3 || Zoned Mitre 3 || Bulimus melastomus 4 || Black-mouthed Bulimus 4 || Colias Statira 5 || Colias Statira 5 Leachiana 6 || Leach's Colias 6 || Carduelis cucullata 7 || Hooded Seed-eater 7 || Merops urica 8 || Javanese Bee-eater 8 || Helix auriculata 9 || Eared Helix 9 || Strombus minimus 10 || Little Strombus 10 variabilis ib. || Variable do. ib. || Drusilla Horsfieldii 11 || Drusilla Horsfieldii 11 || Gobius Suerii 12 || Suerian Goby 12 || Platyrhynchus Ceylonensis 13 || Ceylonese Flatbill 13 || Picus rubiginosus 14 || Brown Woodpecker 14 || Licinia Melite 15 || Licinia Melite 15 || Ismene Oedipodea 16 || Ismene Oedipodea 16 || Bulimus zonatus 17 || Zoned Bulimus 17 || Mitra contracta 18 || Contracted Mitre 18 australis ib. || Southern do. ib. || Tinamus Tataupa 19 || Tataupa Tinamau 19 ||