22 BRITISH DIATOMACE^. 



34. Navicula cryptocephala, i. 53. t. 17. f. 155. B.M. 



a. Newhaven, Dec. 9, 1852. 

 h. Lewes, Feb. 1852. 



§ VI. 



35. NAvictTLA DiDYMA, i. 53. t. 17. f. 154 ; Frontispiece, 



i. f. cliv. B.M. 



a. Pevensey, Sept. 2, 1850. 

 h. Sussex, July 1850. 



36. Navicula BEsroDis, i. 53. t. 17. f. 159. 



Addenda. 



37. Navicula pygm^a, ii. 91. B.M. 



a. Coast of Sussex. 

 6, Sussex, Nov. 1853. 



38. Navicula scutelloides, ii. 91. 



39. Navicula Bacillum, ii. 91. 



40. Navicula l-^vissima, ii. 91. 



41. Navicula pectinalis, ii. 91. B.M. 

 a. Saltcoats. 



42. Navicula retusa, ii. 92. 



43. Navicula Cocconeipormis, ii. 92. 



44. Navicula Rostellltm, ii. 93. B.M. 

 a. Grassmei-e (Aug. 1853). 



45. Navicula Hennedyii, ii. 93. B.M. 

 a. Cumbrae (Jan. 1864, 3Ir. R. Hetmedy). 



46. Navicula Lyra, ii. 93. B.M. 

 a. Salt Pans, Hants. 



