NOTES 



r ;On^Some^New^andi^Rare^rDiatoms;f^ 



H. H. CHASE, M. £>., Linden, Michigan. 



W. C. WALKER, F. R. M. S., Utica, New York. 



LIBRARY 

 NEW YORK 

 BOTANICAL 



(JaRUCN. 



SERIES XX, ZIXi 



-^JANUARY, 1887.N^- 



Coscinodiscus e.jcearattts, Grev. M. 8.; Pritchard's Infusoria, 1861, p. 829 

 J. VIII f. 26; Schmidt's Atlas, PI. 65. f. 1; Franz Joseph Diatoms, p. 21: Three depressions 

 ith three alternating elevations, and found in Piscataway, Naparima and Barbadoes 

 eposits; diameter, .01 inch. 



Var. quadriocellata, Grvnoic, Franz Jos. Diat., p. 21: (=C. Pebigeri): two 



epressions with two alternating elevations; centre with several large cellules arranged 

 round a central one; cellulation radiant and eccentric, diameter .006 inch. Newcastle 

 state, Barbadoes. Plate V. Fig 11 



Var. biocellata, Grun., Franz J. Diats , p. 21: with one depression and one 

 evation; characteristics those of the preceding variety ; same locality; diameter .003 inch. 

 late V. Fig 12. 



In the genuine, the cellules diminish in size toward the centre; in the varieties they 

 so decrease slightly near the margin; in all, the cellulation is radiant and eccentric. 



