JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE III, 



Ilhistrating Dr. Greville's paper on Trinidad Diatomacecr. 



1. — Cocconeis punctatissima (a small example), showing the median line as 



it appears when both valves are united. 

 1* — ^The same ; a single valve. 

 2. — Cocconeis crehrestriata, 

 3. — „ inconspicua. 

 4. — Campi/Miscus fenestratus. 

 5. — „ Ecclesianus. 



6- — Surirella eximia. 

 7. — Navicula Gregoriana. 



Since the description of this Diatom was printed, I have been led 

 to suspect that it may possibly prove to be Navicula lyra, Ehr., 

 as the blank linear spaces in that species seem to be very variable 

 in their character. 

 8. — Navicula compacta. 

 9. — Plevrosir/ma cotnpactum. 

 1 0. — Mastogloia minuta. 



The scale adopted is that of Professor Smith in his admirable Synopsis, except 

 when otherwise indicated. 



