296 Rey. R. T. Lowe on Melampus, &c. 
The absence of an epidermis is the strongest character ; but besides this, 
the want of decussating striae, and of an expanded outer lip, may also 
serve perhaps to distinguish the shells of the Melampodes from those of the 
true Juricule ; and all the species of the former at present known are 
much smaller shells than these 4uricule. From Tornatedla, the charac- 
ters of the animal abundantly distinguish it ; the absence of an opercu- 
lum, shape of the tentacula, and foot, &c. It is more difficult to speak 
about the shells, till the limits of Tornatella itself be more strictly de- 
fined ; but it does not seem improbable that that name should be confined 
to those shells which, like Torn. fasciata, the typical species, are of a thin 
substance, having a regularly striated surface, and a variety of coloured 
markings, whether bands or spots, in which case, the thick solid substance 
of most of the species, their nearly smooth surface, and simplicity of 
colouring, will distinguish the Melampodes. Their short spire, oval or 
turbinate shape, and lengthened aperture, distinguish these shells from 
Pyramidella, to which, however, they appear to have considerable affinity. 
Yet in our ignorance of the animal of Pyramidella, nothing here, indeed, 
can be positively affirmed. They cannot, however, be confounded with 
Voluta, &c. from wanting altogether a notch at the top of the aperture ; 
and this last particular also excludes from the genus a singular little shell, 
whose animal is yet unknown, namely, Marginella auriculata of Menard 
de la Groye, discovered in the Mediterranean ; though this remark more 
properly belongs to the following genus Pedipes, to which this shell 
is said to be more nearly related. 
Class. GASTEROPODA. 
Order. PECTINIBRANCHIA. 
Fam. PLICACEA. 
Genus. Pepipes, Adans., Féruss.; Tornatelle species, Lam.; 
Helix, Gmel., D:llw.; Bulimus, Brug. 
Tas. XIII. f. 8,9, 10, 11; f. 12 shell (Ped. afra.) 
Omnia ut in Melampode ; preter pedem duplicem, obversé soleefor- 
mem, sc. in duas partes, sulco transversali distinctas, divisum. Pars 
anterior latior quam longa, transversa, antic® rotundata: posterior ma- 
jor, longior quam lata, anticé truncata, posticé subattenuata, obtusa, 
brevis, semiovalis. _Operculum nullum. 
