PROSOBRANCHIATA. 183 



All the English specimens I have seen belong to the smooth variety, and do not 

 present the longitudinal ribs and transverse lines which are sometimes found on the 

 earlier whorls of the French shells, nor have I met with any specimen presenting the 

 concentric striae on the surface which characterise the variety from Courtagnon and 

 the neighbourhood of Valognes. 



I have already mentioned the strong resemblance between this species and M. 

 scabra ; in fact, with the exception of the scabrous aspect of the latter, it would be 

 difficult to point out specific differences between the two. 



M. Deshayes states that in some of the French specimens traces of the natural 

 colouring remain, consisting of longitudinal iron-reddish coloured bands. The English 

 specimens, imbedded in a less favorable matrix, do not present any traces of their 

 original colouring. 



Size. — Axis, 1 1 - 1 2ths of an inch; diameter, rather more than 5-12ths of an inch. 



Localities. — Bracklesham Bay, where it is somewhat rare. French .- Grignon, 

 Parnes, Mouchy, Courtagnon, Chaumont, Valognes, St. Felix, Le Tomberay (fide 

 Desk), and Laon (fide Mettev.). 



No. 120. Mitra parva. Soioerby . Tab. XXIV, fig. 1 a — c, and 2 a— c. 



Mitra parva, Sow. 1825. Mill. Con., vol. v, p. 37, t. 430, fig. 1. 



— pumila, lb. 1825. Min. Con., vol. v, p. 37, t. 430, fig. 2. 



— parva, lb. 1850. Dixon's Geol., &c, of Sussex, p. 106. 



— — Morris. 1843. Cat. of Brit. Foss., p. 151. 



— pumila, lb. 1843. Cat. of Brit. Foss., p. 151. 



— parva. D'Orb. 1850. Prod, de Paleont., vol. ii, p. 355, No. 314. 



— pumila. lb. 1850. Prod, de Paleont., vol. ii, p. 355, No. 315. 



— parva. Morris. 1854. Cat. of Brit. Foss., 2d edit., p. 258. 



— pumila. lb. 1854. Cat. of Brit. Foss., 2d edit., p. 258. 



M. testa parva, ovato-fusiformi, sub-turritd, concentrice sulcata, ad basin vice emarginatd: 

 spird elevatd, acuminata .- anfractibus convexis. uno sulco prope marginem suturalem cir- 

 cumdatis ; suturis distinctis : aperturd lanceolatd ; labro undato, acuto, intiis plicifero ; 

 columella quinquies plicatd. 



Far. SEMiLiEVis. Testa anfractibus uno sidco prope marginem suturalem circumdatis ; 

 et ad basin obscure sulcatis, cceterum lavi ; spird exsertiori. 



Far. pumila, fig. 2 a — c. Testa fasciolis elevatis concentricis et costellis longitucli- 

 nalibus decussatd. 



Far. |3. Testa costellarum longitudinalium experti. 



Shell small, ovately fusiform, transversely furrowed, and but slightly notched at 

 the base ; spire elevated, pointed, and formed of seven or eight convex volutions, 



