296 Rev. R. T. Lowe on MelampuSj &;c. 



The absence of an epidermic is the strongest character ; but besides this, 

 the want of decussating strise, and of an expanded outer lip, may also 

 serve perhaps to distinguish the shells of the Melampodes from those of the 

 true Auricula ; and all the species of the former at present known are 

 much smaller shells than these Auricula. From Tornatella, 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 surfice, 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 o^ Pyramidella, nothing here, indeed, 

 can be positively affirmed. They cannot, however, be confounded with 

 Valuta, &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. Pedipes, Adans., Feruss,; Tornatella species. Lam.; 

 HeUx, Gmel., D'dlw.; Bulimus, Brug. 



Tab. XIII. f. 8, 9, 10, 1 1 ; f. 12 shell fPed. ajra.) 

 Omnia ut in Melampode ; preeter pedem dupUcem, obverse soleaefor- 

 mem, sc. in duas partes, sulco transversali distinctas, divisura. Pars 

 anterior latior quam longa, transversa, anticfe rotundata : posterior ma- 

 jor, longior quam lata, antic^ truncata, postice subattenuata, obtusa, 

 brevis, semiovalis. Operculum nullum. 



