38 MOLLUSCA FROM THE GREAT OOLITE. 



Ceritella unilingata, 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 unilineata, D'Orb. 1850. Prod. Paleont., p. 302. 



C. Testa parvd, ovato-elongatd, gibbosd ; spird acuta ; anfractibus (7 — 8) angustatis, 

 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, 14a. 



C. Testa turrit a, acuta ; anfractibus angustatis, nwnerosis, plants ad basim unilineahs , 

 aperturd, et caudd ut in C. acuta. 



Shell 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, acuta; anfractibus (7 — 8) convexiusculis, infra suturam 

 unilineatis ; aperturd obliqud, elongatd ; caudd 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. 



