96 MOLLUSCA FROM THE GREAT OOLITE. 



for road mending, and being, moreover, a very intractable material, none but a persevering 

 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. 



BULLA UNDULATA, Sean. Plate VIII, figs. 8, 8a. 



BULLA UNDULATA, Bean. 1839. Mag. Nat. Hist., p. 61, fig. 22. 

 Morris. 1843. Cat. Brit. Foss., p. 140. 



S. Testa ovatd, ventricosd; apice umbilicato ; umbilico contracto ; labro inferno 

 sinuato ; aperturd magnd, superne angustatd, it/feme dilatiore ; striis increment numerosis, 

 longitudinaliter undatis. 



Shell ovate, ventricose ; apex umbilicated ; umbilicus contracted ; inner lip sinuated ; 

 aperture large; narrow above, wider below; stria3 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 Butta dongata, 

 Phillips, ' Geology of Yorkshire,' pi. 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. 



BULLA LOLIOLUM. Plate VIII, figs. 16, 160, 163. 



B. Testa cylindro-ventricosd; aperturd angustd, basi subdilatatd, vertice. subcontracto, 

 profunde excavate, 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 



