BULLA. 481 



433. Cylindrites cyltndricus, Morris and Lycett. Inferior Oolite variety. Plate 



XLIII, figs. 16 a, 16 6. 



Li this form the upper margin of the last whorl slopes slightly inwards, and 

 encloses the spire-whorls within the depression thus formed, so that even the 

 central mammilla is sunken. 



The figured specimen is thought to be from Nailsworth. It is preserved in 

 the Inferior Oolite collection of the Jermyn Street Museum, and is the only one 

 I have ever seen from that formation. 



Family— Q\]'LLn)M. 



"Shell globular or cylindrical, convoluted, thin, often imnctate- striated ; sjnre 

 small or concealed; ajjerture long, rounded and sinuated in front, lij) sharp.'" — S. P. 



WOODWAED. 



The few representatives of this family (now broken up into Bullid^, Aceridse, 

 and Aplustridse) in the Inferior Oolite may provisionally be retained under Bulla 

 without prejudice to their being recognised as Hydatina or Acer a. 



Genus — Bulla, Linnseus, 1758. 

 434. Bulla Favrei, Lijcett, 1857. Plate XLIII, fig. 10. 



1857. Bulla Favkei, Lycett. Cotteswold Hills, p. 125, pi. iv, fig. 7. 



Description. — Height 36 mm., width 28 mm. 



Shell ovate, ventricose or pyriform, summit contracted, and partially concealing 

 the inner whorls, the first of which is slightly elevated. The columellar lip is 

 drawn out anteriorly and sinuous. Aperture widely ovate anteriorly, and but 

 moderately contracted posteriorly. 



Relations and Distribution. — The mammillary apex and extension of the 

 columella easily serve to separate this shell from Bulla undnlata, Bean. Indeed, 

 they may be generically distinct. A single specimen from a high horizon in the 

 Sjnnosa-stage near Avening, a village not far from Mincbinhampton. 



