332 ANNUAL OF SCIENTIFIC DISCOVERY. 



x 



surface were subsequently magnified 250 diameters, by Professor Quek- 

 ett, of the College of Surgeons, they were seen to exhibit ridges and 

 grooves undistinguishable from those belonging to the striation of liv- 

 ing species of land-shells. The internal tissue also of the shell dis- 

 played, under the microscope, the same prismatic and tubular arrange- 

 ments which characterize the shells of living naollusca. Sections also 

 of the same showed what may be part of the columella and spiral 

 whorls, somewhat broken and distorted by pressure and crystalliza- 

 tion. The genus cannot be made out, as the mouth is wanting. If 

 referable to a pupa, or any allied genus, it is the first example of 

 a pulminiferous mollusk hitherto detected in a primary, or palsezoic 

 rock. 



