342 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Juiie 15, 



angle upon the posterior produced slope, and with the anterior side 

 short and rounded. 



Height 9 lines ; length 1 1 lines ; diameter through both the valves 

 8 lines. 



Localities. — Danes' Hill, Essendine, and the Ketton quarries. 



This species is dedicated to Capt. L. B. Ibbetson, F.R.S., in whose 

 company it was first noticed, much compressed in the clays above 

 the Ketton oolite. 



Turbo gemmatus, Lycett. Pl. XIV. fig. 7. 



Testa ovato-turbinata, spira elata, anfractibus (5) teretibus biangulatis, 

 carinis tuberculosis tribus, anfractu ultimo magno, basi carinis numerosis 

 pan'is, apertiua ovata, umbUico nullo. 



Shell ovately turbinated, spire elevated, whorls (.5) turreted, con- 

 vex, biangulated, and ornamented with three tuberculated carinse, of 

 which the first carina is the smaller ; the last whorl is lai'ge and 

 ventricose ; its base is convex and encircled with numerous small 

 serrated carinse ; the aperture is ovate, its length being equal to 

 two-fifths of the entire shell : no umbilicus. 



The Lincolnshire specimens do not exceed five lines in length, but 

 two specimens from the inferior oolite of Rodborough Hill near Stroud 

 have a length of eleven lines, the diameter of the last whorl being 

 seven lines. The presence of a third carina upon each whorl and the 

 more ventricose form of the last will serve to distinguish it from Turbo 

 capitaneus, Goldf., which in other respects it resembles. It is more 

 slender than Turbo ornatus. Sow., and differs in the arrangement of 

 the carinte. 



Localities. — Ponton, Lincolnshire ; Rodborough Hill, Gloucester- 

 shire. 



Cylindrites turriculatus, Lycett. Pl, XIV. fig. 8. 



Testa elongata, subeylindrica ; spira magna, acuta ; anfractibus (8) convexis ; 

 suturis profunde impressis ; anfractu ultimo ovato ; apertura angusta. 



Shell elongated, subeylindrical ; spire lengthened, its apex acute ; 

 whorls (8) convex, their sutures deeply excavated, the last whorl 

 ovately cylindrical ; aperture narrow. 



The figure of this species resembles C. altus from the great oolite 

 of Minchinhampton, but the whorls are more numerous, and are 

 not flattened as in that shell ; the elevation of the spire readily di- 

 stinguishes it from other contemporaneous species. The length of 

 the aperture is about three-fifths of the entire shell. 



Locality. — Po)iton, Lincolnshire. 



Phasianella Pontonis, Lycett. Pl. XIV. fig. 9. 



Testa turrita, anfractibus convexis (6), spira elata, apice acuto, anfractu ul- 

 timo permagno ventricoso, apertura obliqua, basi angusto. 



Shell with the whorls (G) convex ; spire elevated ; apex acute ; 

 the last whorl very large and ventricose ; aperture oblique ; base 

 narrow. 



The superior size of the last whorl serves to distinguish it from 



