114 MOLLUSCA OF THE GREAT OOLITE OF YORKSHIRE. 



Nerita pseudo-costata. Plate XV, figs. 3, 3a. 



Nebita costata, Phillips. 1835. Geol. of York., vol. i, t. II, fig. 32. 



— — Morris. 1843. Catalogue, p. 154. 



— pseudo-costata, If Orb. 1850. Prod. Paleont., p. 264. 



N. Testa parvd, subhemispharicd ; spird parvd, depressd; costis lonyitudinalibus, 

 regidaribus rotundatis et Icevibus. 



Shell small, subhemispherical ; spire small and depressed ; ribs longitudinal, numerous, 

 regular, rounded, and smooth. 



This shell appears to be identical with the well-known Inferior Oolite species. 

 Occasionally there is some little irregularity about the costse, and they are not always so 

 prominent as in the Yorkshire example. Size that of a moderate-sized pea. 



Locality. Near Scarborough ; also in the Inferior Oolite of Yorkshire. {Phillips.) 



Eulima laevigata. Plate XV, fig. 4. 



E. Testa subulato-turrild, apice acuto ; anfractibus (11) subconveccis, obsolete costatis ; 

 anfractu ultimo symmetrico. 



Shell subulate, turreted; apex acute; whorls (11) very slightly convex, smooth, or 

 with slightly-marked costse ; the last whorl symmetrical. 



This little shell is very subulate, the length of the whorls being nearly equal to their 

 transverse diameter. This character, and the degree of convexity, separates it from a shell 

 very abundant in the Great Oolite at Minchinhampton, which we have described under the 

 title of Eulima communis. In that species the volutions are fewer, and the shell is more 

 pyramidal. Length 7 lines. 



Locality. Near Scarborough. 



Chemnitzia ? vetusta. Plate XV, fig. 7. 



Terebba vetusta, Phillips. 1835. Geol. of York., vol. i, t. 9, fig. 27. 

 — — Williamson. Geol. Trans., 2d Series, vol. v, p. 241. 



Chemnitzia — UOrb. 1850. Prod. Paleont., p. 263. 



C. Testa elonyatd, turritd ; anfractibus (9) subconvexis, longitudinaliter costatis ; safaris 

 depressis j costis circa 12, rotundatis lavigatis curvatis. 



Shell turreted, volutions (9) rather convex, and longitudinally costated ; ribs, about 1 2 

 in a volution, rounded and smooth, bent from left to right; the sutures of the volutions 

 deeply impressed. 



