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 striz 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 J. 
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, 11-12ths 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 
Desh.), and Laon (fide Mellev.). 
No. 120. Mirra parva. Sowerby. Tab. XXIV, fig. 1 a—c, and 2 a—c. 
Mirra parva, Sow. 1825. Min. Con., vol. v, p. 37, t. 430, fig 
silly, 
pumita, J6. 1825. Min. Con., vol. v, p. 37, t. 430, fig. 2. 
parva, J6. 1850. Dixon’s Geol., &c., of Sussex, p. 106. 
— Morris. 1843. Cat. of Brit. Foss., p. 151. 
pumina, 16. 1843. Cat. of Brit. Foss., p. 151. 
parva. D’Orb. 1850. Prod. de Paléont., vol. ii, p. 355, No. 314. 
pumita. Ié. 1850. Prod. de Paléont., vol. ii, p. 355, No. 315. 
parvA. Morris. 1854. Cat. of Brit. Foss., 2d edit., p. 258 
pumiILA. Jb. 1854. Cat. of Brit. Foss., 2d edit., p. 258 
io 0) 
M. testa parva, ovato-fusiformi, sub-turritd, concentrice sulcata, ad basin via emarginata : 
spira elevatd, acuminatd : anfractibus convexis, uno sulco prope marginem suturalem cir- 
cumdatis ; suturis distinctis: apertura lanceolata ; labro undato, acuto, intis plicifero ; 
columella quinquies plicata. 
Var. SEMILEVIS. Testa anfractibus uno sulco prope marginem suturalem circumdatis ; 
et ad basin obscure sulcatis, caterum levi ; spird exsertior?. 
Var. PUMILA, fig. 2 a—e. Testa fasciolis elevatis concentricis et costellis longitudi- 
nalibus decussatd. 
Var. B. 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, 
