298 Proceedings of the Royal Irish Academy. 
Grunow describes the stipes as short, and occasionally slightly 
branched. Kiitzing regards this species as identical with Diatoma 
crystallinum of Agardh, and suggests, with a note of doubtfulness, that 
it may be the same as Echinella fasciculata of Lyngbye. Smith con- 
firms the former opinion, and that on the inspection of authentic spe- 
cimens. Heiberg, who seems to have had the opportunity of inspecting 
authentic specimens of Lyngbye’s species, considers it the same as the 
present. The species I attribute to Lyngbye, and adopt Agardh’s 
name to obviate confusion with other species named S. fasciculata. 
Kitz. Bae:, p. 69, ‘Tavi.; figs 1! Win 8m 8. D2 Vola p14, 
Pl. xii., fig. 101. MRalfs, in Pritch., p. 789. Grunow, Verhand der 
K. K. Zool. Bot. Gesel., Band xii., 1862, p. 407. Heiberg, De Danske 
Diat., p. 64. Rab. Fl. Eur., sect. 1, p. 189.—Diatoma chrystalli- 
num, Agardh Consp., p. 52.—LEchinella fasciculata, Lyngb. Tent. 
Hydrophyt. Dan., p. 210. 
On sea-weeds, Salthill, Co. Dublin. From stomachs of Ascidians, 
Roundstone Bay, Co. Galway. On sea-weeds, near Dundalk, Co. 
Louth. On sea-weeds, Belfast Lough, Co. Antrim. 
Synedra fulgens, (Greville.) Marine. 
Similar to the preceding species, with which it is often associated, 
but may be distinguished by the greater delicacy of the strie. The 
stipes as described by Kiitzing is long and branched. (PI. 28, fig. 7.) 
Wim. Sm., 5. D., Volo 1., p14 Flo xu. ie 10s). walte a 
Pritch., p. 789. Grunow, Verhand der K. K. Zool. Bot. Gesel., Band 
xil., 1862, p. 408. Raben. Fl. Eur., sect. 1, p. 140. Cleve, Om 
Svenska och Norska Diat., p. 220.—Lichmophora fulgens, Kitz. 
Bac., p. 123, T. xii., fig. 5. Kiitzing and Smith concur in the iden- 
tification of this species with Exilaria fulgens, Greville, who has a 
prior claim to the authorship of this species. 
Salt ditch near Wexford. Bannow, Co. Wexford. Sea-weeds, 
Malahide. Stomachs of Pectens, Dublin Bay. Dollymount, Co. Dublin. 
Stomachs of Ascidians, Co. Clare. Sea-weeds, Dundalk, Co. Louth. 
Sea-weeds, Belfast Lough, Co. Antrim. 
Synedra baculus, (Greg.) Marine. 
Similar to preceding species, but not expanded at. the middle or 
ends as it is; strice somewhat coarser, and without the submarginal 
longitudinal lines. (PI. 28, fig. 8.) 
Gregory, Q. J. M.S. Trans., Vol. v., 1857, p. 88, Pl. 1., fig. 54. 
Sea-weeds, Co. Clare. Stomachs of Ascidians, Roundstone Bay, 
Co. Galway. 
