Schizonema.] ALQJE DIATOMACBiE. 253 



2. G. paradoxum, Ag. Doubtful Gomphonema. Aggre- 

 gated, yellow ; stipes erect, dichotomous ; the frustula wedge- 

 shaped, somewhat corymbose. Grev. — Grev. in Hook. Br. Fl. 

 v. ii. p. 410.— Echinella paradoxa, Grev. Crypt, t. 25. 



Parasitic on small marine Algae ; common. Scarcely of this genus, 

 and, perhaps, more allied hoth in habit, and in the shape of the frus- 

 tula, to Licmophora. 



96. Schizonema. Ag. Schizonema. 



Frustula in longitudinal series, and enclosed in a simple or 

 branched filiform mucous, or membranaceous frond.— Name, 

 a X l £ w > to divide, and vqiia, a thread ; in allusion to the se- 

 paration of the frustules. Grev. 



1. S. comoides, Ag. Tufted Schizonema. Filaments in lax 

 tufts, capillary, branched; branches nearly simple, elongated. 

 Grev.— Grev. in Hook. Br. Fl. v. ii. p. 413.— Conf. comoides, 

 Dillw. t. 27. 



On rocks and corallines in the sea. Malbay ; W. H. Harvey. I 

 confess myself imperfectly acquainted with this species— I may say 

 with the whole genus— and refer my Irish specimens, with much hesita- 

 tion, to the above figure. 



2. S. Smithii, Ag. Sir J. E. Smith's Schizonema. Fila- 

 ments tufted, gelatinous, irregularly branched ; branches spread- 

 ing, acute ; frustula oblong, in numerous parallel series, gemi- 

 nate, at length separating. Grev. — Grev. in Hook. Br. Fl. v. ii. 

 p. 414. Grev. Crypt, t. 298.— Ulvafcetida, E. Bot. t. 2101. 



On rocks &c. in the sea. Bantry Bay ; Miss Hutchins. 



I wish to take this opportunity of introducing to the notice of Irish 

 Botanists a most useful collection of dried specimens of Algae, now in 

 course of publication by Mrs. Mary Wyatt, at Torquay ; and I have 

 pleasure in stating, that my valued friend, Mrs. Griffiths, (whose name 

 is a sufficient guarantee for the correctness of the synonyms,) has 

 kindly taken on herself the naming and arranging of all the species. 

 Three quarto volumes, containing One hundred and fifty species, 

 have already made their appearance under the title of " Alg/e Dan- 

 monienses ; or dried specimens of Marine Plants, principally col- 

 lected in Devonshire ;" a fourth may be expected in the course of next 

 year. The specimens are not only beautifully preserved and displayed, 

 but in most cases, where a species produces a secondary or dioecious 

 fructification, individuals are given presenting each mode of fruit ; and 

 so great has been the care bestowed on the selection of species, that 

 a very large number of the rarest and least known of British Alga; 

 may be found in these volumes. Amongst others, the following may 



