Valves nearly circular. Area nearly circular, but with in< 

 tions of a thickened angle top and bottom. Rays narrow, sub- 

 acute at tips, approximating, with a fine line of dots down their 

 length and a faint linear prolongation into the area. Between each 



pair oi . ■. acute marginal bead of o - oo66 in Length. Area 



finely punctate over the central clepsydrate portion. No appear- 

 ance of a central line or Raphe. This diatom I have from the 

 deposit of Etarand in Hungary, where it was first noticed and 



pointed out to me by my friend. Fred. Kitton. I have named it after 



Dr. J. Pantocsek, the great explorer o( the diatoma< eous deposits 



of Hungary. 



