CLOSTERIUM. 375 



pi. ii. Sanaitica, f. 9. 1828. Closterium multistriatum, 

 Abliandl. cler Akademie d. Wissensch. zu Berlin, 1829, 

 p. 15 — 20. Closterium acerosum, Symbolaa Physica3, 

 Evertebrata, text 1830 (1831); Polygastrica, fol. b. 

 a. 2. Closterium acerosum, Abhandl. der Akademie d. 

 Wissensch. zu Berlin, 1831, p. 68. Closterium Lunula 

 Morren, fig. 43. ; Ehr. Infus. p. 93. pi. vi. fig. 1. Cijm- 

 bella IIoj)/{irkii Moore, in Ord. Survey ; Harv., in 

 Manual, p. 215. CI. acerosum Jenner, in Flora of 

 Tunbridge Wells, p. 196. Co7if. ovata, Flora Glottiana. 

 Hab. Near Glasgow : il/r. Hopkirk. About Lisburn and 

 in one of the caves, Cave Hill, Belfast : 3Ir. Moore. 

 Warbleton, &c. : Mr. Jeiiner. Gal way : 3I'Colla. 

 There is no species hitherto described Avith which it is 

 necessary that this should be compared, the straight and 

 fusiform frond rendering it clearly distinct from all other re- 

 corded species. This species was named by Mr. ]\loore Cym. 

 Ho2)MrMi, in memory of INIr. Hopkirk, author of " Flora 

 Glottiana." 



e. Closteria straight, not lunar. 



12. Closterium Trabecula Ehr. 

 Plate LXXXVIII. Fig. 3. 



Char. Frond broad, longitudinallij symmetrical, somewhat 

 quadrangidar. Granules scattered or disjjosed in several 

 series. ^n(\ochvon\Q fasciated. Bands several. 

 Closterium Trahecida, Abhandl. der Akademie d. Wis- 

 sensch. zu Berlin, 1830, p. 62. 70. ; 1831, p. 68.; Ehr. 

 Infus. 93. pi. V. fig. 2. ; Jenner, in Flora of Tunbridge 

 Wells, p. 196. 

 Hab. Busthall Common ; Piltdown Common ; Scrubbs, 

 Colebrookc Park ; Waterdown Forest : Mr. Jenner. 



This Closterium bears some resemblance in form at least to 

 CI. margaritaceum, but diflxirs from that species in being 

 altogether much larger, in its entire margins and in the posi- 



