40 GEORGE WEST ON AMPHORA INFLEXA. 



ch, chromatopliore containing an elongated pyrenoid ; ge, ge^, 

 overlapping edges of the two opposing girdles ; st, striae on= 

 the girdles. C. Diagrammatic sectional view of a frustule;.: 

 the heavy and light lines represent respectively the valves; 

 and girdles ; the two dots indicate the raphe of each valve. 

 D. Lineate transverse striae of valve x 3,000 diams., showing 

 punctae. E. Longitudinal striae of girdle x 3,000 diams., 

 showing rows of punctae alternating with zones of silex ; the- 

 latter at this focus appear alternately light and dark. 



Joum. Quehett Microscoficai Clul, Ser. 2, J'oJ. -S.'F., I/o. $4, April 1919, 



