GASTEROPODA. 63 



Trochus Bunburii. Plate X, fig. 1, la, lb. 



T. Testa conicd; apice acuto; anfractibus (5) cingulatis; cingulis acutis incequalibus, 

 basi lavi; aperturd obliqud. 



Shell conical; spire acute; whorls (5) cingulated; encircling ribs unequal, and varying 

 in different individuals ; the base smooth ; the aperture oblique. 



The costse are very large, elevated, and unequal, so as to obscure the sutures of 

 the whorls. 



Locality. It is by far the most abundant of the Great Oolite species in the vicinity of 

 Minchinhampton, and is common to all the shelly beds. 



This species is named in compliment to E. H. Bunbury, Esq., M.P., F.G.S. 



Trochus pileolus. Plate X, figs. 5, 5#, 53. 



T. Testa turbinatd, lavissimd; anfractibus (4>)planis; apice obtuso; anfractu ultimo ad 

 basin angulato; basi convexd; aperturd parvd. 



Shell turbinated, very smooth ; whorls (4) flattened ; apex obtuse ; the last whorl 

 encircled with a prominent rib near to the base ; base convex ; aperture small. 



The very obtuse spire, and nearly cylindrical form of the last volution, give to the shell 

 a cap-like figure. 



Locality. From the white stone of Bussage. It is rare. 



Trochus anceus, Gold/. Plate X, figs. 7, la. 



Trochus anceus, Goldfuss. 1842. Petref., iii, p. 55, t. 180, fig. 3. 

 — — Bronn. 1848. Index Palseont., p. 1296. 



T. Testa turbinatd, parvd, oblique costatd, basi cingulatd; anfractibus (5 — 6) tetra- 

 gonis cingulatis; cingulis quaternis granulatis. 



Shell small, turbinated, obliquely costated, base cingulated ; whorls (5 — 6) angular, 

 encircled with four rows of granules. 



Locality. Of this minute shell we have only obtained two examples, from the white 

 stone of Bussage, and believe it to be rare. 



The sutures in the specimens, figured by Goldfuss, are more distinct. 



Trochus obsoletus, Boemer. Plate XI, figs. 1, la. 



Trochus obsoletus, Roemer. 1836. Nordd. Oolith., p. 151, t. 11, fig. 5. 

 — — Bronn. 1848. Index Palseont., p. 1303. 



