SYNEDRA. 



3*7 



I":: 1 



il 



IV. TOXARIUM. Valve very narrow, but much enlarged 



in the middle and at the apices, and covered with 



irregular puncta. Marine species. 



S. undulata (Bailey) Greg. (Diat. of Clyde, p. 59, 



pi. 14, f. 107 ; H.V.H. Atl., pi. 42, f. 2* ; Type No. 303), plate 

 10, fig. 437. 



Valve very long and very narrow, inflated at the median por- 

 tion and at the apices, strongly undulated throughout its length. 

 Puncta forming irregular lines, about 1 2 in 1 c.d.m. on the 

 narrow portion of the valve, arranged irregularly on the en- 

 larged portions. Length, about 40 to 45 c.d.m. 



Marine. Not yet found in Belgium, but found in England, Scotland, France, etc. 



S. Hennedyana Greg. (Diat. of Clyde, p. 60, pi. 6, 



f. 108 ; H.V.H. Atl., pi. 42, f. 3*), plate 10, fig. 438. 



Valve very narrow, not undulated, strongly inflated in the 

 middle and at the apices, covered with puncta, rather coarse, 

 arranged irregularly. Length, attaining up to 90 c.d.m. 



Marine Ostend (Deby. ), very rare. Scotland (Gregory). 



Fig- 73- 



Toxarium 



Hennedyana. 



