16 



Description of some New Diatomace^e found in the 

 Stomachs of Japanese Oysters, by Fred. Kitton, 

 Hon. F.R.M.S., Hon. Memb. Q.M.C. ; with a List of 

 the Species observed by E. Grove, F.R.M.S. Also a 

 Description of some New or Undescribed Forms from 

 other Localities, by F. Kitton. 



Read June 27th, 1884. 



PLATE IV. 



The stomachs of Oysters and other molluscs have frequently 

 been examined by Diatomists in the expectation of finding the 

 siliceous skeletons of the Diatomaceae mixed with the partially 

 digested food ingested by the mollusc, among others by Gaillon, 

 "who, in 1820 described his Vibrio ostrearius (== Naricida ostrearia, 

 Turpin = N. fusiformis, Grim., var. ostrearia, Turpin). M. De 

 Brebisson found a new species of Amphora (A. ostrearia) in Cal- 

 vados Oysters (Kiitzing, " Sp. Alg.," p. 94), and M. Bornet says 

 that the Oysters in the beds at the mouth of the Loire become 

 green by feeding on N. fusiformis, var. ostrearia (Grunow and 

 Kitton in '-'Month. Mic. Jour.," 1877, p. 179) ; see also the de- 

 tails of M. Puysegur's investigations " On the Green Colour of 

 Oysters," in " Revue Maritime et Coloniale," Feb., 1880, and 

 "Trans. Roy. Mic. Soc," Vol. iii, 1880, p. 931. 



M. P. Petit obtained from some Chinese Oysters two new species 

 Cocconeis Ningpoensis and Triceratium rostratum and two new 

 varieties Aclinanthes subsessilis, var. enervis, and Coscinodiscus 

 lineatus, var. oculatus, which he figures and describes in his paper, 

 entitled, " Diatomees sur les Huitres de Ningpo et de Nimroud 

 Sound (Chine)." (" Mem. de la Soc. des Sci. Nat. et Math, de 

 Cherbourg," t. xxiii., pp. 201,209, PI. I, 1881.) In addition 

 to the above he detected 72 previously described species. 



Last year one of our members, Mr. G. Sturt, availed himself 

 of the opportunity of purchasing some " tinned " Oysters from 



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