96 MOLLUSCA FROM THE GREAT OOLITE. 
for road mending, and being, moreover, a very intractable material, none but a persevermg 
local collector can be expected to obtain even a partial knowledge of its fossil contents. 
His reward will usually be, as in the present instance, mere imperfect casts, which contrast 
unfavorably with the products of the richer and softer shelly beds. 
Buia unpunata, Bean. Plate VIII, figs. 8, 8. 
Buiua unpunata, Bean. 1839. Mag. Nat. Hist., p. 61, fig. 22. 
= — Morris. 1843. Cat. Brit. Foss., p. 140. 
4 
B. Testd ovatié, ventricosd ; apice umbilicato; umbilico contracto ; labro interno 
sinuato ; aperturd magnd, superné angustatd, inferne dilatire ; striis incrementi numerosis, 
longitudinaliter undatis. 
Shell ovate, ventricose ; apex umbilicated ; umbilicus contracted ; inner lip simnated ; 
aperture large; narrow above, wider below; strie of growth numerous, longitudinally 
undulated. 
Breadth, two thirds of the length. 
The specimen figured by Mr. Bean in the ‘Magazine of Natural History,’ from the 
Cornbrash of Yorkshire, is about half as large again as the shell here described, and the 
inner lip is not so much sinuated; but in other respects it is very similar. 
The general features of this shell bear a considerable resemblance to the Bulla elongata, 
Phillips, ‘ Geology of Yorkshire,’ pl. iv, fig. 7; but it is much less elongated than that 
species. 
Locality. Our specimen was obtained from the upper portion of the Great Oolite 
formation, in a bed of hard brown shelly sandstone, 95 feet above the Fullers-Earth, one 
mile and a half east of Minchinhampton. Rare. 
Butta Louiotum. Plate VIII, figs. 16, 16a, 160. 
B. Testa cylindro-ventricosd ; apertura angusta, basi subdilatatd, vertice subcontracto, 
profunde excavato, margine elato, et rotundato. 
Shell cylindrical, but ventricose ; aperture narrow, its base rather dilated, apicial cavity 
somewhat contracted and deeply excavated; the mamillary apex of the whorls being 
large, and rising considerably from the base of the cavity, but not so high as the outer 
margin ; margin of the cavity elevated, narrow, and rounded. 
The figure is nearly barrel-shaped, both the extremities appearing truncated and 
narrower than in the middle part. The character of the apicial cavity resembles that of 
several species of Cylindrites, figured upon the same plate; we have not been able to expose 
the base of the columella; but, judging from the general figure of the shell and of the 
