88 MOLLUSCA FROM THE GREAT OOLITE. 



CERITELLA UNILINEATA, Sow., sp. Plate V, fig. 13. 



BUCCINUM UNILINEATUM, Sow. 1825. Min. Con., t. 486, figs. 5, 6. 



Morris. 1843. Cat. Brit. Foss., p. 139. 

 PURPURINA. TOILINEATA, If Orb. 1850. Prod. Pateont., p. 302. 



C. Testa parvd, ovato-elongatd, gibbosd; spird acutd; anfractibus (7 8) anywtatis, 

 superne plants et subangulatis. 



Shell small, ovately elongated, gibbose, ; spire acute ; whorls (7 8) narrow, flattened 

 in their upper portions or subangulated. 



This little gibbose shell has a spire about equal in length to the last whorl ; the whorls 

 are bevilled near to their upper junctions, or slightly depressed, which gives the appearance 

 of a line or furrow encircling them. Axis 4| lines, transverse diameter 2 lines ; but the 

 Ancliff specimens are usually smaller. 



Locality. The white stone of Bussage has furnished only one specimen near Minchin- 

 hampton ; but it is much more abundant at Ancliff. 



CERITELLA PLANATA. Plate V, figs. 14, 14. 



C. Testa turritd, acutd ; anfractibus anymtatis, numerosis, plants ad basim unilineatis , 

 aperturd et caudd ut in C. acutd. 



SheU turreted, acute ; whorls narrow, numerous, flattened ; a single encircling line is 

 placed at the lower part of each whorl, a little above the suture; aperture and canal as in 

 C. acuta. Axis 4^ lines, transverse diameter 2| lines. 



Locality. Rare : the specimen figured is from the white stone of Eastcombs, in the 

 parish of Bisley. 



CERITELLA SOWERBII. Plate V, fig. 16. 



C. Testa turritd, subfusiformi, acutd; anfractibus (7 8) convexiusculis, infra suturam 

 unilineatis ; aperturd obliqud, elonyatd ; cawdd brevi. 



Shell turreted, subfusiform, acute; whorls (7 8) slightly convex, with a transverse 

 line beneath the suture ; aperture oblique, lengthened ; canal short. 



This species varies considerably in the elevation of the spire. Axis 8 lines, transverse 

 diameter 3 lines. 



Locality. It occurs in the upper portion of the shelly beds, both north and south of 

 the vale of Brimscomb. It is rare. 



