GASTEROPODA. 25 



slightly convex ; the last volution is lengthened, its upper margin is rounded ; the aperture 

 is very narrow. 



More lengthened and attenuated, the spire more elevated, and its apex more obtuse, 

 than in C. acutns, to which species it appears to be most nearly allied. 



Geological Position and Locality. The Great Oolite of Minchinhampton, collected by 

 E. Witchell, Esq. 



CTLINDRITES TURRICULATUS. Tab. XLIV, figs. 26, 26 a. 



CYLINDRITES TURRICCLATUS, Lycett. Proc. Geol. Soc., 1853, p. 342, vol. ix, pi. 14, 



fig. 8. 



Testa elongatd, subylindricd ; spird magnd, acutd ; anfractibus (8) convexis ; suturis 

 profunde imprcssis ; anfratu ultimo ovato ; apcrtura angustata. 



Shell elongated, ovately cylindrical ; spire lengthened, its apex acute ; volutions (8 in 

 the adult state) convex, their sutures deeply impressed, the last volution ovately cylindrical ; 

 aperture narrow. 



The general figure somewhat resembles C. altus, but the volutions are more numerous, 

 and are not flattened, as in that shell ; the subovate figure and elevated spire readily distin- 

 guishes it from other contemporaneous species. The length of the aperture is equal to 

 three fifths of the entire shell. 



Geological Position and Localities. Formerly collected at Ponton, Lincolnshire, by 

 Professor Morris ; recently it has been obtained in the Great Oolite of Minchinhampton 

 by E. Witchell, Esq. 



ACTEON BATHONICTJM, Lye. Tab. XLIV, fig. 16. 



Testa parva ovata, spira elevata, anfractibus (4) subplanis, ad suturam angulatis, supra 

 angulam .yiratis, tabulatis, ultimo anfractu striis regularibus tenuibus ; apertura ovali, 

 postice angustata. 



Shell small, ovate, spire elevated, volutions (4) rather flattened upon the sides and ele- 

 vated, their superior borders forming a sharply defined angle ; above the angle is a flattened 

 sutural area, the last volution has regular, delicate, encircling striations ; the aperture is 

 moderately large, ovate ; the posterior extremity narrow ; its length is more than half the 

 height of the shell. 



A minute but well-marked species, with a spire larger, more lengthened, more angulated 

 and more pyramidal than Auricula Sedyvici, Phil. ; it is more nearly allied to Tornatella 

 Aviothensis, Buv., 'Pal, Mense,' pi. xxiii, figs. 32, 33 ; and to Tornatella pulla, Kock and 

 Dunk., ' Ool.,' pi. xi, fig. 11; but these have the spire more lengthened and less 

 flattened. 



Geological Position and Locality. One of a series of minute and, for the most part, 



4 



