354 GASTEROPODA OF THE INFERIOR OOLITE 
*¢ TURBO.” 
A certain number of smooth turbinate forms are classed provisionally under 
Turbo. 
288. Turso tavicatus, Phillips, 1829 
1829 and 1835. Turso tavieatus (NeRira pHvreara, Sow., Min. Conch.), Phillips. Geol. 
Yorks., pt. 1, pl. xi, fig. 31; and 38rd 
edit. (1875), p. 380, pl. xi, fig. 31. 
1885. Nerrrorsis (? TurBo) ta#vieaTa, Phil., pars. Hudleston, Geol. Mag., 
dee. 3, vol. ii, p. 49, pl. ii, fig. 3. 
Cf. also ? Turzo earezosvs, d’Orbigny. Terr. Jur., vol. ii, p. 342, pl. eeexxx, figs. 1—3. 
? Monoponta taviaata, Thorent. Morris, Cat., p. 258. 
I must refer to my remarks in the ‘Geol. Mag.’ restricted to var. B. See 
also antea, p. 344, with reference to “ Neritopsis levigata.” It still remains a 
matter of doubt what the Phillipsian species may be. The specimen from the 
York Museum, figured in the ‘Geol. Mag.’ (vol. cit., pl. ii, fig. 3) is, perhaps, the 
nearest, but the system of undulating spirals seen in that specimen on close in- 
spection is rather puzzling. I have in my own collection a similar but smaller 
fossil from the Dogger, where such spirals are not noticeable. 
? Variety from the Lincolnshire Limestone, Pl. XXIX, fig. 1. 
Height . : = : 6°5 mm. 
Width , , : : 75 mm. 
Spiral angle (cogulan) ; 90% 
Shell smooth, turbinate, oblique, not mmbilieatede spire 2 subdaprasaad apex 
sharp. Number of whorls about five, smooth, tumid, and well marked off by the 
suture. Body-whorl fully two-thirds the entire height, regularly convex, large and 
without ornament other than broad growth-lines. Aperture wide and circular, 
with a rather thin outer lip, and an excavated and slightly encrusted columella, 
which carries no denticle, but is scored by a double furrow. 
Although there is a superficial resemblance to the turbinate forms described 
above under Ataphrus, there are several indications which point to a different 
genus. ‘Thus the apex is sharp, not obtuse, the spire regular, the sutures are 
impressed, and the texture, as shown by the broad growth-lines, is coarse. 
In a second and smaller specimen which I possess these lines exhibit colour- 
markings. The aperture is wide, and there is no actual denticle. 
