CLOSTERIUM. 373 



zu Berlin, 1830, p. 62.; 1831, p. 67. Closterium tenue 

 Klitzing, Synopsis Diatom, in v. Schlechtendal's Lin- 

 n^ea, p. 595. tafel xviiL f. 78. ; Ehr. Infus. p. 94. taf. vi. 

 fig. 5. ; Jenner, in Flora of Tunbridge Wells, p. 196. 



Hab. Piltdown Common: Mr. Jenner^ 

 Apparently a very distinct little species. 



c. Closteria appendaged, curved, striated, 



8. Closterium rostratum Ehr, 

 Plate LXXXVII. Fig. 6. 



Char, Closterium fusiform, slender, slightly curved, striated, 

 much attenuated, appendaged, each horn scarcely equalling 

 the body in length, often much shorter. 



Closterium rostratum, Abhandl. der Akademie d. Wis- 

 senscli. zu Berlin, 1831, p. 67. ; 1833, p. 240. Frustulia 

 subtilis and subulata Klitzing? Synops. Desmid. p. 538. 

 taf. xiii. fig. 3., 1833. Closterium caudatum Corda, Al- 

 manac de Carlsbad, p. 190. 209. tafel v. fig. ^^., 1835 ; 

 Jenner, 1. c. p. 196. .A^-^-^.--, 



Hab. Heathfield ; Warbleton ; Waterdown Forest, &c. : y^>2^ 

 Mr. Jenner. High Beech : A. H. H. 



A singular but not uncommon species. 



9. Closterium setaceum Ehr. 



Plate LXXXVII. Fig. 7. 



Char. Frond fusiform, setaceous, straight, or very slightly 

 curved, faintly striated, appendaged, appendages longer 

 than the frond itself. 



Closterium setaceum, Abhandl. der Akad. d. Wissensch. 

 zu Berlin, 1833, p. 239. ; Jenner, in loc. cit. p. 196. 



Hab. Waterdown Forest, and near Cross in Hand : Mr. 

 Jenner. Cheshunt Common : A. H. H 



B B 3 



