MELOSEIRA. 399 



2. Meloseira orichalcea Kutz. 

 Plate XCIII. Figs. 6, 7. 



Char. Filaments rather slender^ tohen recent of a fawn colour. 



Frustulcs two or three times longer than broad, twice 



divided near the centre. 

 Klitzing, in Linna3a, 1833, ]}. 71. fig. 68. Gallionella auri- 



chalcea Ehr., Die Infus. p. 168. t. 10. fig. 6. ; Amer. 



Bacil. part 2. p. 5. pi. xi. fig. 4 b. 

 Hah. In ditches and slow streams, Chcsliunt : A. H. H. 



Stevenston, Ayrshire : Rev. D. Landsborongh. Dol- 



gelly : Mr. Ralfs. 



This species differs from Meloseira varians., with Avhich it 

 might be confounded, in its smaller filaments, different colour, 

 longer fnistules, in the double division of these, and especially 

 in the dentated margins, by which M. orichalcea is related to 

 Meloseira arenosa, and which is the only character in common 

 between the two species. The Galliondla disians of Ehr, 

 comes close to this species, if it be not identical with it. 



** Margins of the cells smooth. 



3. Meloseira varians Ag. 



Plate XCIII. Figs. 4, 5. 



Char. Filaments rather thick, dark brown, becoming greenish 

 in drying. Frustules once or once and a half as long as 

 broad, once divided in the centre. 

 Ag. Conspect. Diatom, p. 64. ? Kiitz. in Linnsea, p. 71. 

 fig. 69. ; Harv. Br. Alg. p. 195. M. lineata Ag., Syst. 

 p. 8. ; Harv. in INIanual, p. 1 95. Gallionella varians 

 ■ Ehr., Die Infus. t. 10. fig. 4. G. aurichcdcea Bailey, 

 Amer. Bacil. part 2. pi. 2. fig. 4 c. Conf. lineata Dillw., 

 p. 44. t. yS Jurg, Dec. 5. No. 18. Conf. hyemalis Jurg, 

 Dec. No. 17. No. 6. Vesiculifera comjmsita Ilassall, in 

 Annals of Nat. Ilist. vol. x. p. 394. ; Ralfs, in Annals, 

 vol. xii. p. 350. pi. ix. fig. 5. 



