GASTEROPODA. 7 



straight, large, obtuse, encircled with regular striations ; sutures of the volutions distinctly 

 marked. 



The costse 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. 



CERITIIIUM BULIMOIDES, Desl. Tab. XLIV, fig. 3. 



CEKITHIUM BULIMOIDES, Deslongchamps. Mem. Soc. Linn, de Normand., 1848, 



vol. viii, pi. 11, fig. 40. 

 D'Orb. Prodr., i, p. 303. 



Testa minima, elongaio-turrita, acuta, anfractibus rotundatis, tramvcrsim striatis, longi- 

 tuditialiter costatin, costis rectis, basi obliqua, transverse striata, apertura subrotunda, 

 colmnella marginata, canali nullo. (Deslongchamps.) 



Shell minute, elongated, turreted, acute ; volutions (8) slightly convex, wide, trans- 

 versely striated and longitudinally costated ; costse 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 costae, 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, Luc. 



CERITIIIUM MULTIFORJIK, Piette. Tab. XLIV, fig. 20. 



CEHITHIUM MULTIFOMME, Piette. Bull. Soc. Geol. Fr., 2 ser., t. 14, pi. 5, p. 553. 



Testa parva clongato conica, anfractibus (9 10) angustis, convexis, siduris valde im- 

 prcssis, costis subobliquis (10 ad 12 in ambitu), magnis, lincis cingcndis (5) enqKalibu-'i ; 

 anfractu ultimo ad basin lincato, canda brevi. 



Shell small, elongated, conical; volutions (910) narrow, convex, the sutures deeply 

 impressed; costa; 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 costae, 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 costse likewise differ. 



