GASTEROPODA. 23 
convex volutions, which are encircled with six regular striations ; the aperture is ovate, the 
base somewhat flattened and smooth; there is no umbilical depression. 
A small shell, with the last volution expanded and depressed ; the striations are rendered 
slightly scabrous by very delicate, obtuse, decussating ornamentation, partially preserved, 
and which is only visible under a considerable magnifying power. 
Geological Position and Locality. The Great Oolite of Minchinhampton Common, 
collected by Mr. Witchell. 
Monoponra composira, Lyc. Tab. XLV, fig. 6. 
Testa parva subdepressa, spira anfractibus 3—4 angustis, angulatis, superne concavis ; 
lineis angustis, regularibus subdistantibus cingendis, anfractu ultimo permagno, superne 
costulis depressis longitudinalibus lineis decussatis; aperturd magné ovatd, columella 
solida, dentata. 
Shell small, rather depressed; spire with the volutions (3—4), angulated in their 
middle part, narrow, delicate, and rather distantly arranged, the last volution is very large ; 
the surface above the mesial keel is concave, and has closely arranged, depressed, longitu- 
dinal, little elevations or ribs, which are rendered nodulous in their upper parts by the 
encircling lines; the aperture is moderately large; the columella has a conspicuous 
thickening at its base ; there is also a slight umbilical depression. 
Geological Position and Locality. The Great Oolite of Minchinhampton Common, 
collected by Mr. Witchell. 
SotaRium Batuonicum, Lyc. Tab. XLV, figs. 27, 27 a, 27 4, 27 c. 
Testa parva depressa, superne planata, inferné concav6, concentrice striaté ; anfractibus 
(3) angustis tabulatis, externe subcarinatis nodulisque paucis, obscuris, coronatis ; lateribus 
subconvecis striatis. 
Shell small, depressed, flattened above, concave beneath and concentrically striated ; 
volutions (3) narrow, tabulated, externally slightly carinated, and with a few obscure 
coronary tubercles; the upper and lateral surfaces have encircling striations, the sides 
being slightly convex. 
The specimen examined has a diameter of only two lines, the height being equal to 
about one third of the breadth. 
Geological Position and Locality. 'The upper beds of the Great Oolite in the vicinity 
of Bath, collected by Charles Moore, Esq. 
