56 MOLLUSCA FROM THE GREAT OOLITE. 
Sect. 1. Inner lip smooth. 
NV. Testé crass, subhemispherica ; spird parva obliqud, depressd ; anfractibus paucis, 
carinatis; aperturd semilunari; labio dextro crasso, labio interno planato, amplo. 
Shell thick, subhemispherical ; spire small, oblique, depressed ; whorls few, carinated ; 
aperture semilunar ; outer lip thick and smooth; inner lip flat, broad, and smooth, without 
notch or striz. 
NeERITA CANCELLATA. Plate XI, fig. 15, 15a. 
NV. Testé crassa, hemisphericd; spird pared, depressd, obtusd; anfractibus (3) carinis 
tribus cancellatis; carinis obtusis, striis longitudinalibus decussatis, et lineis inequalibus 
et irregularibus cinctis ; apertura transverse oblonga. 
Shell thick, hemispherical; spire small, obtuse, depressed; whorls (3), with three carine 
cancellated ; carinze obtuse, decussated with longitudinal strize: the last whorl has also 
irregular, unequal, encircling lines, which form, with the longitudinal striz, a cancellated 
surface ; aperture transversely oblong ; inner lip very wide. 
The most frequent aspect is that of a very rugose, depressed Nerife, with large, obtuse 
carine and intermediate sulcations ; the distinctly cancellated surface is observable only in 
the younger examples. The first and second carine are placed near together; between 
these and the basal carina is a large surface, with encircling lines crossing the striz. 
Portions of coloured surface are sometimes observed upon the carinze and upper portion of 
the last volution. 
Locality. It is moderately rare at Minchinhampton Common and Bussage. 
Nerita rucosa. Plate XI, fig. 17, 17a. 
R. Testa hemispherica; spird parvd, depressa; anfractibus (2 vel 3) carinato-striatis ; 
ultimo anfractu subangulato, carinis tribus (carind mesa majore), et strits profundis longi- 
tudinalibus plus minusve crebris; coloribus fuscis sepé pictis; labio interno, lato, planato. 
Shell hemispherical; spire small, depressed; whorls (2 or 3) carinated and striated ; 
the last whorl subangulated, having three carine, of which the middle one is the most 
prominent and rounded ; the last whorl has, also, longitudinal, deeply-marked striz, more 
or less closely arranged, and not unfrequently marked with colours, arranged into two 
broad encircling bands, separated by the mesial carina. 
The longitudinal strize might sometimes, with more propriety, be termed costa; when 
the coste are large and distant the carine are likewise most prominent, and occasionally 
both conditions may be observed in the growth of the same specimen—the smaller 
