GASTEROPODA. 85 
SromatraA? (Mzcastoma), Buvignieri. Plate IX, fig. 32, 32 a. 
S. Testd semiglobosd; spird parva, depressd; anfractu ultimo transversim costulato, et 
in medio carinato, carind acutd, elatd, costis longitudinalibus densis, lineis tenuissimis 
impressis notatis; apertura magna semilunari; labio externo fisso ? 
Shell semiglobose ; spire depressed ; last whorl with a mesial, elevated, acute carina, 
crossed by longitudinal, narrow, elevated ribs—the ribs being impressed by fine encircling, 
transverse lines; aperture very large; outer lip slightly notched. ‘The shell above the 
carina is flattened ; the ribs, which are perfectly regular, pass over the carma, and beneath 
are decussated by fine transverse lines. 
Locality. This rare shell, which attains the size of a small bean, has only been found 
in the soft oolite beneath the planking on Minchinhampton Common. 
We have dedicated this species to M. Buvignier, who has figured and described some 
apparently congeneric forms under the name of Sfomatella carinata and S. funata. (See 
*Mém. Soc. Phil. Verdun,’ 1843, p. 19, t. 5, f. 27—30.) 
Family— FIsSURELLID2. 
Fissurenia, Lam. 1801. 
FissurELLus, Montfort, 1810. 
Shell conical, base entirely open, orbicular or oval; apex central or subcentral, having 
a foramen of an oval figure, central, or near to the anterior or shorter side ; surface usually 
cancellated, or ornamented with ribs and lines; margin generally thickened; muscular 
impression nearly continuous. 
FissureELLA acuta, Des/. Plate VIII, fig. 5, 5a—c. 
FissURELLA AcuTA, Deslongchamps, 1842. Mém. Soc. Linn. de Normandie, tom. vii, 
pl. 7, figs. 22—24. 
RIMULA — D Orb. 1850. Prod. Paléont., p. 303. 
F. Testd conicd, altd; basi subcirculari; apice acuto, subcentrali; foramine subapicials, 
antice versato, superne rotundato, inferne rimd angusté producto, striis longitudinalibus 
parvis crebris, aliis transversis testam decussantibus. (Deslong.) 
Shell conical, elevated, nearly circular; apex acute, nearly central; foramen a little 
anterior to the apex, rounded above, narrow below; striz longitudinal, small, closely- 
arranged, crossed by others, transverse and less prominent. Height 3 lines, base 3 lines. 
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