GASTEROPODA. 7 
straight, large, obtuse, encircled with regular striations ; sutures of the volutions distinctly 
marked. 
The costze form straight, rounded elevations, which pass the whole length of the spire, 
and are only slightly interrupted by the sutures, the height of each volution being equal 
to about two thirds of its opposite measurement. It appears to be rare. 
Length three lines, breadth half the length. . 
Geological Position and Locality. The upper beds of the Great Oolite near Bath, 
associated with numerous other minute testacea, collected by Charles Moore, Esq. 
CrritHiuM BuLIMoIDES, Des/. Tab. XLIV, fig. 3. 
CERITHIUM BULIMOIDES, Deslongchamps. Mém. Soc. Linn. de Normand., 1548, 
vol. viii, pl. 11, fig. 40. 
— — D Orb. Prodr., i, p. 303. 
Testa minima, elongato-turrita, acuta, anfractibus rotundatis, transversim striatis, longi- 
tudinaliter costatis, costis rectis, basi obliqua, transverse striata, apertura subrotunda, 
columella marginata, canali nullo. (Deslongchamps.) 
Shell minute, elongated, turreted, acute; volutions (8) slightly convex, wide, trans- 
versely striated and longitudinally costated ; cost about 8 in a volution, perpendicular 
and obtuse; the sutures are deeply impressed, the aperture is oblique and rounded ; 
there is no basal canal. . 
The costa, which are large and elevated, are slightly knotted where they are crossed 
by three encircling lines in each volution ; our specimen is imperfect at the base. 
Geological Position and Localities. ‘The Great Oolite of Minchinhampton, collected 
by E. Witchell, Esq. France, Lue. 
Crrituium muutivorms, Pictfe. Tab. XLIV, fig. 20. 
CrRITHIUM MULTIFORME, Piette. Bull. Soc. Géol. Fr., 2 ser., t. 14, pl. 5, p. 553. 
Testa parva elongato conica, anfractibus (9—10) angustis, eonvexis, suturis valde in- 
pressis, costis subobliquis (10 ad 12 in ambitu), magnis, lineis cingendis (5) equalibus ; 
anfractu ultimo ad basin lineato, cauda brevi. 
Shell small, elongated, conical; volutions (9—10) narrow, convex, the sutures deeply 
impressed ; cost large, from 10 to 12 in a volution, longitudinal, but slightly oblique, 
and knotted by five rows of regular encircling lines, the last volution has encircling lines 
at the base; the canal is short. 
The tumid, narrow volutions, large cost, and deep sutures, afford strong distinctive cha- 
racters, the height of each volution being only slightly greater than a third of its opposite 
measurement. The specimens figured by M. Piette vary much in the elevation of the spire, 
and consequently in the breadth of the volutions; the number of costze likewise differ, 
