482 GASTEROPODA OF THE INFERIOR OOLITE. 



435. Bulla (Hydatina) undulata, Bean, 1839. Microraorpbic variety. Plate 



XLIII, figs. 11a, Ub. 



1839. Bulla undtjlata, Bean. Ann. Mag. Nat. Hist., n. s., vol. iii, p. 61, fig. 22. 

 1851. — — — Morris and Lycett, Grt. Ool. Moll., part 1, p. 96, 



pi. viii, figs. 8, 8 a. 



Height 6*5 mm., extreme width 5 mm. 



Besides being considerably smaller than Bean's species, this variety is rather 

 wider in proportion to its height, but in other respects it would be difficult to 

 separate them. But cf. Bulla globulosa, Cossmann. A single specimen in my 

 Collection from the Scarborough Limestone. 



There is a specimen, also in my Collection, from the Inferior Oolite near 

 Radstock, which has a height of 10 mm., and whose proportions accord better 

 with those of Biilla undulata. 



