GASTEROPODA. 5 



iNIiiseum, for information respecting it, and also for a careful drawing Avliich exhibits its 

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

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

 Colleorc. 



CD 



Gco/or/ica/ Posifions and Localities. It has occurred at several localities in the Corn- 

 brash, as at AVollaston, Chippenham, Trowbridge, and in Rcdfordshirc, 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 INIuseum, from the slate of Stonesficld. 



GASTEROPODA. 



Bhaciiytrema varicosa, Li/c. Tab. XLIV, fig. 27. 



Testa parva ovata , gihbosa , splra anfractihas 5 suhplanis, coslis transvcrsalihus ctlongi- 

 tudinalihus inaqualibus cmciatis ; (jranulalis, (jranuUs macjnis, depressis, idtimo anfractu 

 varicibus irrefjularibiis duohus ; apertura si^mosa, columella arcuafa, canali breviicscido. 



Shell small, ovate, gibbosc; 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 costao being smaller, irregular, 

 and unequal; they arc decussated by very irregular, granulated, straight costoc, 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, Avith strongly marked and very irregular ornamentation ; the 

 varices are prominent only upon the tAvo latter volutions ; the straight costoe are very 

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

 unusually short, and curved forwards; the lips are Avithout denticulations. 



Geolocjical Position and Localiiy. The Great Oolite of Minchinhampton Common ; very 

 rare, tAvo specimens. 



Braciiytrema buccinoidea, Lijc. Tab. XLIV, fig. 17. 



Testa turricidata, ovali ventricosa, anfraciibus 5 — 4 convexis, sufuris valdc ivipressis, 

 Ion f/itudinal iter costatis, cosfislA: — 16 rectis, transvcrdm jinissinie lineatis, anfractu idtimo 

 niagno, rotundo, basi otte?mato, canali brevi, obliquo ; apertura superne et inferne constricto. 



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

 longitudinally costated ; the costa3, from 14 to IG in a volution, are perpendicular, and not 

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



