165 



On some Fossil Marine Diatoms Found in the Moravian 

 "Tegel," from Augarten, near Brunn. 



By Prof. P. T. Cleve, Hon. F.R.M.S. 



(Read June 26th, 1885.) 



PLATES XII and XIII. 



In the marine deposits of Moravia, known as Tegel (marl or clay), 

 belonging to the miocene and pliocene divisions of the tertiary 

 formation, fossil diatoms have been recently found by Herr E. 

 Thum, of Leipzig, who has kindly sent to me a collection of 

 mounted specimens for description. He informs me that they 

 were detected in the " Tegel," from Augarten, near Brunn. 

 Whether it belongs to the miocene or pliocene formation I am 

 unable to determine. 



The following is a list of the species sent by Herr Thum : — 



Cocconeide^e. 



Cocconeis pellucida, Hantzsch in Rab. Beitrlige, p. 21, PI. 6, 

 Fig. 11 (1863). Grunow, Novara Alga?, p. 12. (Not C. pellucida 

 of Verb., 1863.) I have seen three upper valves. Length, 

 •084--143 mm. ; breadth, '063--084 ; striae, 12 in the -01 mm. 

 This species is found in the warmer seas, as the Mediterranean, 

 Bed Sea, Indian Ocean, &c, and also in the Nankoori deposit. 



MASTOGLOIACE.E. 



Orthoneis splendida (Greg.), Gran. Cocconeis splendida, Greg. 

 D. of CI., p. 21, PI. 1, f. 29 (1857). C. punctatissimaj Grev. 

 Mic. Journ., v., p. 8, PI. iii, f. 1 (1857). Mastogloia cribrosa, 

 Grun. Verb., p. 577 (1860). Orthoneis splendida, Grun. Novara 

 Algae, p. 15 (1867). Van Heurck Syn., PI. 28, f. 1-2 (1880). I 

 have seen four examples from this deposit. Length, -088- '168 

 mm. ; breadth, '07-'13 ; puncta, 5 in "01 mm. Living specimens are 

 smaller, and measure in length *05 to "11 mm., breadth -03- # 09 mm. 

 Striae in living specimens vary from 5 \ (Greg.) to 8 (Grev.) in -01 

 mm. 



