GASTEROPODA. 67 
somewhat exceeds its transverse diameter ; it is moderately large, and wide at the base ; 
the junctions of the whorls are strongly marked; the encircling coste are large, closely 
arranged, and very densely nodulated. Axis 8 lines, transverse diameter of the last 
volution 6 lines. 
Locality. Minchinhampton Common, where it occurs in the coarse planking: it is 
moderately rare. 
We have dedicated this species to H. Gomonde, Esq., of Cheltenham, who has kindly 
allowed us the use of his collection of oolitic fossils. 
Monoponta, Lamarck. 1801. 
Shell turbinated, aperture entire, base of the columella forming a tooth, with an 
exposed umbilicus half surrounding it; beneath the tooth is a longitudinal groove, the 
edges of which are acute ; the outer lip is thick, striated within. 
Monoponta Lyrtin, Archiac. Plate XI, figs. 4, 4a, 0. 
Monoponta LYELLII, Archiac. 1843. Mem. Géol. Soc. France, tom. v, t. 29, fig. 8. 
— -— Bronn. 1848. Index Palzont., p. 742. 
Turso Lyetiu, D’Orb. 1850. Prod. Paléont., p. 301. 
M. Testa turbinatd, spird acuta, anfractibus (4) convexis, tricinctis; cingillis elatis et 
nodulosis; nodulis approximatis, antrorsum concavis; anfractu ultimo ventricoso, cingillis 
7 ornato, ultimo cingillo maximo et profunde crenulato; umbilico magno. 
Shell turbinated ; spire elevated, acute ; whorls (4) convex, encircled with three carne ; 
carinee elevated and nodular ; nodules placed close together, and concave on their anterior 
sides; the last whorl ventricose; encircling bands 7, the last being the largest and is 
deeply crenulated ; the umbilicus is large. 
The markings vary considerably in this species. In some specimens the encircling 
coste are nearly smooth, in others they are merely notched; but the greater number are 
distinctly nodulated ; the junctions of the whorls are deeply impressed; and the entire 
shell is very thick. 
Locality. This shell is abundant in the shelly beds near Minchinhampton ; the size 
varies from a diameter of 1 line to 5 lines. In the Great Oolite, Eparcy (Aisne), France. 
Monoponta impricata. Plate XI, figs. 3, 3a. 
M. Testé parva, conicé; spird acuminata; anfractibus subplanis; striis imbricatis, 
transversis (4) cinctis; anfractu ultimo ad basin subangulato. 
