172 EOCENE MOLLUSCA. 



swelling into large, rounded tubercles. Aperture ovately rhomboidal, terminating 

 behind in a narrow, but conspicuous, channel ; outer lip smooth within, thickened 

 towards the suture, otherwise thin and sharp-edged ; inner lip narrow, thick, particu- 

 larly at the posterior extremity, where it forms almost a callus ; columella curved, and 

 furnished with two prominent folds in front, and sometimes a third faint one behind. 



The Volutes which I propose to separate under the present specific name, have been 

 confounded hitherto with the preceding species (V. costata, Sol.) ; they appear, how- 

 ever, to be specifically distinct. The shells are broad, obtusely angulated at the 

 shoulders, with flattened sides ; the ribs are more distant, thicker, and rounder, and on 

 the last two whorls rise at the shoulder into large tubercles ; the transverse hneation 

 is more regular, and the aperture wider, and not contracted behind ; the inner lip is 

 much thicker, the columella more curved, and furnished with two folds, or, occasion- 

 ally only, with a third faint one behind ; and the base is much more bent backwards, 

 owing to the deeper anterior notch. Specimens occasionally occur in which, owing to 

 the tubercles being less prominent than usual, the spire is more regular in form, and 

 the shells present a general resemblance to V. costata.; but the whorls still preserve the 

 flatness of the sides, and the ribs their characteristic- roundness ; and the condition of 

 the columella and the inner lip show, in fact, that the individuals in question are merely 

 a variety of the present species. 



Size. — Axis, 2 inches and 2-10ths; diameter, 1 inch and l-10th nearly. 



Localities. — Barton, and Bracklesham Bay. 



Section A. (Puilus small, conical. ~) 



b. Shell fusiform ; costated, transversely > continued, 

 striated ; inner lip narrow) J 



j3. Columellar plaits numerous. 



No. 111. Voluta Maga. F.E.Edwards. Tab. XXII, figs. 2 a— f. 



Voluta magorum. Sow. 1821. Min. Con., vol. iii, p. 164; t. 290, fig. 3. 



— — Morris. 1843. Cat. Brit. Foss., p. 168. 



— harpula. Sow. 1840. Min. Con., vol. vii, p. 7 ; t. 614, fig. 1. 



— — Morris. 1843. Cat. Brit. Foss., p. 167. 



— costata. Sow. 1850. Dixon's Geol., &c, of Suss., p. 107, t. 5, fig. 24. 



— magnorum (ex errore). D'Orb. 1850. Prod, de Paleont., vol. ii, p. 353, No. 281. 



— decora? Beyr. 1853. Die conchyl. des Norddeut. tertiarg. vol. i, p. 73; t. 4, 



figs. 5 a — b. 

 Nee. — magorum. Brocc. 1814. Conchol. foss., Subapen., vol. ii, p. 307 ; t. 4, fig. 2. 

 nee. — harpula. Lamk. 1802. Ann. du Mus., vol. i, p. 478, No. 9, and vol. xvii, p. 78, 



No. 13. 



V. testa ovato-fusiformi, unduloso-costatd, inermi, transversim tenuissime striata, ad 

 basin prof unde emarginatd ; spird obtusd; apice sub-acuto ; anfractibus sex vel septem, 



