36 GEORGE WEST ON AMPHORA IN FLEX A, 



pleura in the English Mechanic, November 3rd, 1916, p. 293. 

 W. Smith in his British Diatomaceae, 1856, vol. ii. p. 90, calls it 

 Amphipleura inflexa, as found by Mr. J. Ralfs, at Ilfracombe. 

 In Pritchard's Infusoria, 1861, p. 783, Ralfs describes it under 

 the same name, giving a poor illustration, PL IV. fig. 31. About 

 1868 a new genus was instituted for this diatom by Th. Eulen- 

 stein of Stuttgart when issuing it with his type-slides of diatoms. 

 He called it OJcedenia inflexa in honour of Mr. F. Okeden, a 

 British engineer and diatomist, who wrote in the microscopical 

 journals about 1855 to 1858. De Toni, in his Sylloge Algarum, 

 II, I, p. 229 (1891), maintains Eulenstein's generic name, 

 adding two other doubtful species. This diatom is mentioned, 

 and illustrated by two poor figures in Van Heurck's Treatise 

 on the Diatomaceae, English edition, 1896, p. 135 ; where by error 

 it is placed under section Halamphora of Amphora, instead of 

 under section Amblyamphora. That author, apparently, had 

 never gathered specimens nor seen them living. Besides the 

 two localities already mentioned it has also been found at 

 Biarritz, South-West France, by Leuduger-Fortmorel, and.. 

 according to Cleve, from the estuary of the Tay, and the Adriatic. 

 Cleve gives no authorities for his statement, but the Tay obser- 

 vation was probably by Mr. Richard Rattray, a working 

 engineer and diatomist of Dundee. This naturalist must not 

 be confounded with Mr. John Rattray who wrote the excellent 

 monographs on Coscinodiscus, Aulacodiscus, Auliscus, etc., 

 whose native place was Perth. "Dick" Rattray wrote very 

 little, but was an assiduous collector and preparer of diatoms, 

 who greatly assisted Adolf Schmidt, and whose name is fre- 

 quently mentioned in the Atlas der Diatomaceen-Kunde. 



Regarding the various names of the diatom in question the 

 structure of the raphe is sufficient, alone, to distinguish it from 



