BRITISH DIATOMACE^. 71 



Sect. III. Pseudo-nodule indefinite. 



7. Synedra salina, n. sp. V. lanceolate, gradually attenuated to- 

 wards the somewhat obtuse extremities; striae distinct, 32 in "OOl". 

 Length -0075" to -0142". v.v. 



Marine. Poole Bay, June 1848, TF. Sm. 

 Plate XI. 88. 



8. Synedra radians, W. Sm. V. linear-lanceolate, extremities some- 

 what dilated, obtuse ; frustules arranged in a radiate manner ; striae 

 24 in -001". Length -0050" to -0116". v.v. 



Synedra splendens, Kvitz. Bacill. xiv. 16. ad specim. quae misit amic. DeBre- 

 bisson. ExilaiHa Ulna, Hass. Alg. xcvii. 2. ad specimina quae commuui- 

 cavit cl. Jenner. JDiatoma truncatum, Grev. B. F. p. 407. 



Fresh water: verycomnion. Plumpton, Sussex, Apr. 1852, W. Sm. Speld- 

 hurst, Kent, May 1843, Mr. Jenner. Cheshunt, Dec. 1842, Mr.Hassall. 

 Lough Mourne and Peterhead Deposits. 



Plate XL 89. PI. XII. 89 /3. 89 y. Frustules with endochrome. Frontis- 

 piece, fig. LXXXIX. 



9. Ssrnedra Ulna, EAr. V. lanceolate-acute; frustules not radiating ; 

 striaj 24 in -001". Length -0028" to -0085". v.v. 



/3. V. linear, suddenly acuminated. 

 /3. Kiitz. Bacill. xxx. 28. 



Freshwater: common. St. Brelades, Jersey, Aug. 1852. 

 Plate XL 90. Var. /5. PI. XL 90 /3. 



10. Synedra Oxyrhynchus, Kutz. V. lanceolate, suddenly attenu- 

 ated towards the very acute extremities, v.v. 



Kiitz. Bacill. xiv. 8, 9, 10, 1 1 ? 



Fresh water. Near Lewes, Feb. 1852, W. Sm. 

 Plate XL 91. 



11. Synedra obtusa, W. Sm. V. linear, extremities rounded ; striae 

 24 in '001". v.v. 



Synedra Ulna, Ehr. Inf. x\Ti. ll S. cequalis, Kiitz, Sp. Alg. p. 45. ad specim. 

 quae dedit amic. De Brcbisson. 



