GASTEROPODA. 5 



Museum, for information respecting it, and also for a careful drawing which exhibits its 

 palseontological features ; the specimen was obtained in the Bradford Clay of the Tetbury 

 Road Railway Station, near Cirencester, by Professor Coleman, of the Royal Agricultural 

 College. 



Geological Positions and Localities. It has occurred at several localities in the Corn- 

 brash, as at Wollaston, Chippenham, Trowbridge, and in Bedfordshire, but it is every- 

 where rare ; to these positions must be added the single specimen above alluded to from 

 the Bradford Clay, and another, in the British Museum, from the slate of Stonesfield. 



GASTEROPODA. 



BRACHYTREHA VARICOSA, Lye. Tab. XLIV, fig. 27. 



Testa parva ovata, gibbosa, spira anfractibus 5 subplanis, costis transversalibus ct longi- 

 tudinalibus inaqualilus cruciatis ; yranulalis, granulis magnis, depressis, ultimo anfractu 

 varicibus irreyularibus duobus ; apcrtura sinuosa, coliirnella arcuata, canali brcviusculo. 



Shell small, ovate, gibbose; spire elevated, obtuse, consisting of five, flattened volutions, 

 with well-marked sutural depressions ; encircling costse five, of which the first and last 

 are large, forming elevated bands, the three intermediate costse being smaller, irregular, 

 and unequal ; they are decussated by very irregular, granulated, straight costae, which 

 occasionally form large varices, of which the last volution has two ; these -impart a distorted 

 aspect to the lower part of the shell ; the aperture is rather narrow and sinuated, the 

 columella much curved, the canal short, the notch narrow and deep; the outer lip is 

 thickened, but imperfect. 



A short, ovate shell, with strongly marked and very irregular ornamentation ; the 

 varices are prominent only upon the two latter volutions ; the straight 'costse are very 

 irregular, sometimes crowded, but occasionally very distantly arranged ; the basal canal is 

 unusually short, and curved forwards ; the lips are without denticulations. 



Geological Position and Locality. The Great Oolite of Minchinhampton Common ; very 

 rare, two specimens. 



* 



BRACHYTREMA BUCCINOIDEA, Lye. Tab. XLIV, fig. 17. 



Testa turrictilata, ovali vcntricosa, anfractibus 5 4 convexis, suturis valdc imprcssis, 

 lonr/itiidinalitcr costatis, costis 14 16 rectis, transversimjinissitne lineatis, anfractu ultimo 

 magno, rotunda, basi attenuate, canali brevi, obliquo ; apcrtura superne ct infernc constricto. 



Shell turreted, ovately ventricose, volutions 5 4, convex, the sutures deeply impressed, 

 longitudinally costated ; the costee, from 14 to 16 in a volution, are perpendicular, and not 

 very strongly defined ; they are decussated by fine, encircling lines ; the last volution is 



