20 

 PLATE 5. Diatomacece. 



Nitzschia (Angularis). Valve lanceolate puncta in a single row on 

 margin ; longitudinally striated ; size about .005 inch ; centre light 

 brown, indistinct. 



Fl - 2 - Triceratium. (Front view.) 



Fl - 3 ' Synedra (Fulgens). Inflate at centre, and at extremes ; strife only 



on each margin ; numerous. .0065 inch. 



FlG - 4- Synedra (Tabulata). Taper towards extremities ; strise marginal : 



numerous. 



FlG - 5 - Synedra (Radians). Extremes obtuse ; strife across ; numerous. 



FIG. 6. Naricula. 



FIG. i. Tryblionella (Hopeii, named after Admiral Sir J. Hope, G.C.B.). 



Oval, =.002 inch ; striated rows of circular cells ; no central nodule 

 perceptible witli ^-power. 



Fl -2. Cymbella. Extremities obtuse ; striae indistinct. (Three views) 



FIG. 3. 

 FLO. 4. 



FIG. 5. Diatom, pin-headed. 



Octagonal, fractured (?) Diatom (?) Strife across, probably Ltcmo- 

 phora. 



