372 DESMIDE^E. 



Closterium striolatum, Abhandl. der Akademie d. Wissensch. 

 zu Berlin, 1831, p. 68. ; 1833, p. 238, Closterium cos- 

 tatum ! and CL spirale Corda, Almanac de Carlsbad, 

 1835, p. 191. taf. v. f. 6163. and fig. 67. ? ; Ehr. In- 

 fus. p. 96. taf. 6. fig. 12. ; Jenner, 1. c. p. 196. 



Hob. Several places in Sussex and Kent : Mr. Jenner. 

 Hertford Heath: A. H. H. Aberdeen: Dr. Dickie. 

 Galway: M'Colla. 



This is a smaller species, more attenuated at the extre- 

 mities, and with striae more evident than in Closterium tur- 

 gidum. Each segment is occasionally divided by a transverse 

 line, as is well represented in one of the figures given by 

 Ehrenberg. 



6. CLOSTERIUM LINEATUM Ehr. 

 Plate LXXXVIII. Fig. 1. 



Char. Frond very long, slender, slightly curved, in the centre 

 cylindrical and filiform, much attenuated at each extre- 

 mity, distinctly striated, often twenty times as long as 

 broad. 



Closterium lineatum, Abhandl. der Akademie d. Wissensch. 

 zu Berlin, 1833 (1832), p. 238. ; Ehr. Infus. p. 96. t. 6. 

 fig. 8. ; Jenner, in Flora of Tunbridge Wells, p. 196. 

 Hob. Ashdown Forest : Mr. Jenner. 



This is one of the most striking species of the genus ; the 

 granules are often arranged in single series, but sometimes 

 they are scattered. 



7. CLOSTERIUM CORNU Ehr. 

 Plate LXXXVIII. Fig. 2. 



Char. Frond small, very slender, sub cylindrical, slightly 

 curved. Endochrome undulated. 



Vibrio Lunula Miiller, Animalc. Infus. tab. vii. fig. 8. ? 

 Closterium Cornu, Abhandl. der Akademie d. Wissensch. 



