30 BRITISH DIATOMACE^, 



17. Pleurosigma distortum, i. 67. t. 20. f. 210, B,M. 



a. Sussex, Auff. 1850, 



18. Pleurosigma Fasciola, i. 67. t. 21. f. 211. B.M. 



a. Hastings, Nov. 11, 1851. 



b. Hastings, Nov. 1851. 



19. Pleurosigma macrutvi, i, 67. Supp. t. 31. f. 276. B.M. 



a. Itford, Sussex, Sept. 27, 1852. 



b. Itford, Sussex, Oct. 1852. 



20. Pleurosigma pkolongatl^i, i. 67. t. 22. f. 212. B.M, 



a. Shoreham, Sussex, Sept. 1852. 

 6. Shoreham, 1862. 



21. Pleurosigma tenuissimum, i. 67. t. 22. f, 213. 



22. Pleurosigma littorale, i. 67. t. 22. f. 214. B.M. 



a. Pevensey, Nov. 7, 1850. 



b. Sussex, Nov. 1850. 



23. Pleurosigma Hippocampus, i, 68. t. 22. f. 215. B.M. 



a. Lewes, Sept. 1850. 



b. Lewes, Sept. 1850. 



24. Pleurosigma attenuatltm, i. 68. t. 22. f. 216. B.M. 



ii. Dorcliester, May 28, 1849. 



b. Plumpton, April 18, 1852. 



c. Plumpton, Sussex, April 1851. 



25. Pleurosigma lacustre, i. 68. t. 21. f. 217. B.M. 



n. Brooks, Lewes, Sept. 1850. 

 h. Lewes, Oct. 1851. 



26. Pleurosigma Spencerii, i. 68. t. 22. f. 218. B.M. 



a. (Readiup:), Mr. Poulton. 

 h. Leives, Sept. 1850. 



III. Gifrosigma. 



27. Pleurosigma transversale, ii. 97. B.M. 



a. Pleurosigma Navirulaceum. Stomach of a Scallop, Feb. 

 1854. 



