M/ 33 



NOTES 



On Some New and Rare Diatoms, 



BY 



W. C. WALKED, F. CR. JS£. S. , Utica, New Yor7z> 



H. H. CHASE, M. &., Geneva, JVew Yot^Tz. 



LIBRARY 

 NEW YORK 

 BOTANICAL 



GARDEN. 



Diiueregraiiuiia Baldjickii, Kali's: (Brightwell.) A good view is given of this 

 much-named Diatom. Brightwell was the first to figure and describe it : we give the synonymy : 



Odontidium Baldjickii, Brightwell. M. J. 1859, p. 180, Pi. 9, Fig. 9. 

 Dimeregramma B.. Bait's. Pritchard's Infusoria, p. 791, 1861. 

 Rhaphoneis B.. Grunow, Austrian Diats.. p. 37U. 1862. 

 Achnanthes B.. Grunow. Arctische Diat., p. 21, 1880. 



No satisfactory reason for this latest change is given : from an examination of a large num- 

 ber of specimens we are inclined strongly to place it back in the Genus Dimeregramma, Halt's. /. c. 



The essential characteristics of Achnanthes preclude the entrance of this Diatom, as we have 

 no record of a frustule having different valves, one of which possessed median and terminal 

 nodules: Rhaphoneis is characterized by moniliform striae; Dimeregramma Baldjickii is costate, 



the costa* being 10 in .001 inch: the valves are very uniform in size, being .003 inch in length. 

 by .0015 inch wide. Habitat. Baldjick, Turkey. Plate 1. Fig. :'>. 



Bicldulpliia Imperially X. Sp., W. C. Walker. Large; LO-angled; angles acute, 



with prominent horn-like processes; distance between angles .00229 inch; diameter of valve 

 .0076 inch ; sides deeply concave : valve surface divide* I into two portion.-, the inner circular porti< »n 



