21 

 Diatomacece -(continued). PLATE 5. 



Melosirece (1) Nearly circular. Two drawings are here given one FIGS, i & 2. 

 with -power, the other -|, =540 and 900 diameters. When touched 

 under the glass the form fell into detached rings, as shewn in A. 



Aulacodiscus. Very beautiful ; but as the nodules were indistinct FIG. 3. 

 it may be found a Cyclotella ; cells not reaching to margin ; processes 

 two, but indistinct ; cells circular, blue and pink hue in centre ; eleven 

 dark cells, with alternate transparent ones near margin ; central nodule (?) 

 A fracture shown near centre. 



Views 1 and -2. Fio. 4. 



