TRANSACTIONS OF MICROSCOPICAL SOCIETY. 



DESCRIPTION OF PLATE IV, 



Illustrating Dr. Greville's paper on New Diatoms, Series I. 



Fig- 

 1. — Stidodiscus Buryanus, focused for tlie radiating lines. 



2. — The same, focused to show the plicate character of the disc. 



3. — A^. Johisonianus. 



4. — S. insignis, X 600. 



5. — Coscinodiscus armatus. 



6. — C. tuberculatus. 



7. — C. biradialus. 



8. — C. elegantulus. 



9. — C. Barbadensis. 

 10. — Triceratium capifatum. 

 11. — T. Westianum. 

 12. — T. Barhademe. 

 13. — T. nitidum. 

 14. — T. cellulosum. 



All the figures are X 400, except fig. 4, which is x 600 diameters. 



The Barbadoes species are described from a fine series of slides supplied 

 by Mr. J. T. Norman. 



