GASTEROPODA. 31 



C. Testa subulatd, apice acuto, anfractibus (10 11) planatis, pent'agonalis, longi- 

 tudinaliter costatis; costis 5 in ambitu, perpendiculariter continuis, elaiis, subacutis ; strii* 

 numerosis transversis impressis ; canali minima. 



Shell subulate, apex acute, whorls (10 11) flattened, pentagonal, longitudinally 

 costated ; costae continuous, perpendicular, elevated, rather acute, 5 in a volution ; striae 

 numerous, transverse ; canal very small. 



This elegant, symmetrical, and remarkable species has the junctions of the whorls strongly 

 marked ; it ranks among the choicest of our smaller shells. Axis 9 lines, transverse 

 diameter 2 lines. 



Locality. It has been found only in the planking of Minchinhampton Common and 

 white stone of Bussage. We are not aware that more than four examples have been 

 discovered. 



CERITHIUM STRANGULATUM, Archiac. Plate IX, fig. 18. 



CEHITHTUM STRANGULATUM, Archiac. 1843. Mem. Geol. Soc. France, v, p. 382, t. 31, 



figs. 1, a, b. 



D'Orb. Prod. Paleont., p. 303. 

 Bronn. Index Palaeont., p. 274. 



C. Testa minutd, subcylindricd, pupceformi, costatd ; anfractibus subplanatis 7, trans- 

 versim sulcatis; sulcis 4, penultimo 5; costis (6) rectis, elatis et longitudinaliter continuis 

 ab apice ad anfractum penultimum ; apertura constrictd, parvd, obliqud subrotundd ; canali 

 nullo. 



Shell minute, subcylindrical, or pupaoform, costated ; whorls nearly flat (7), transversely 

 sulcated, sulci 4, and 5 upon the penultimate whorl; costa3 6, straight, elevated, and 

 longitudinally continuous from the apex to the penultimate whorl ; aperture contracted, 

 small, oblique and somewhat rounded ; no canal. 



This little shell has prominent lines dividing the transverse sulcations ; the costal 

 elevations, although strongly marked upon the first three or four whorls, are not dis- 

 tinguishable upon the latter two; these whorls have also a greater proportional length than 

 the others, their breadth but little exceeding their height ; the junctions of the whorls are 

 not very strongly marked, the apex of the spire is obtuse, the aperture much contracted, 

 rounded, and oblique or pupseform. 



The obtuse spire, flattened whorls, and fewness of the costae, will distinguish this from 

 C. bulimoides, Deslongchamps, and C. Rocmeri, Goldfuss ; to which in other respects it has 

 some resemblance. We have considered it a variety of C. strangulatum, Archiac, although 

 in that species the apex is pointed, the general breadth is greater, and the costae are 

 continued even to the base of the shell. 



Locality. Ancliff, Wiltshire ; Eparcy, France. 



