70 BRITISH DIATOMACE/E. 



Fresh water. Boggv pools, Dorsetshire, Dec. 1849, W. Sm. Dolgelly, 

 Mr. Ralfs. 



Plate XI. 83. 



Sect. II. Pseudo-nodule definite, annular. 



3. Ssmedra pulchella, Kiltz. V. lanceolate, slightly constricted to- 

 wards the obtuse extremities ; pedicel frequently dilated into a com- 

 pressed dichotomous stipes ; frustules forming flabella ; strise 33 

 in -001". Length -0018" to -0046". v.v. 



Kutz. Bacill. xxix. 87. " Ctenopliora pulchella" Breb. sic cl. De Brebisson 

 in Uteris cum specim. Oct. 1852. 



Fresh water. Peuzance, Mr. Ralfs. Jersey, Aug. 1852, W. Sm. 



Plate XI. 84. Supp. Plate XXX. 84*. 



4. Synedra gracilis, Kiitz. V. as in the last; pedicel not dilated; 

 pseudo-nodule less distinct; frustules scattered; striae 39 in -001". 

 Length -0018" to -0041". v.v. 



Kiitz. Bacill. iii. 14. xiv. 2. xv. 8. 



Brackish water. Poole Bay, Mar. 1848. "Brooks" near Lewes, Apr. 1851, 

 W. Sm. 



Plate XI. 85. Frustules with endochrome, Frontispiece, fig. LXXXV. 



5. S3rnedra acicularis, W. Sm. V. lanceolate, acute; striae very 

 faint, 36 in -001". Length -0022" to -0055". v.v. 



Synedra Icpajis, Kiitz. Bacill. xv, 8? 



Brackish water. Poole Bay, June 1849. Excet, Sussex, March 1850. 

 Lancing, Sussex, Aug. 1852. 



Plate XI. 86. 



6. Synedra minutissima, Kutz. V. linear-lanceolate, extremities 

 obtuse; stricE 3G in -001". Length -0009" to -0021". v.v. 



Kiitz. Bacill. iii. 30 ? 



Fresh water. Birkenhead, Cheshire, Mr. Shadbolt. Near Lewes, Oct. 1850, 

 W. Sm. 



Plate XI. 87. 



